diff --git a/requirements.txt b/requirements.txt
index 9458638..07ddf85 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,4 +4,5 @@ pydantic>=2.10
 pyyaml>=6.0
 gpu-tracker>=5.0.1
 bandit>=1.7.7
-semgrep>=1.99
\ No newline at end of file
+semgrep>=1.99
+docker>=7.0.0
\ No newline at end of file
diff --git a/src/sandbox/__init__.py b/src/sandbox/__init__.py
new file mode 100644
index 0000000..2fb752b
--- /dev/null
+++ b/src/sandbox/__init__.py
@@ -0,0 +1,6 @@
+"""Sandbox module for secure code execution."""
+
+from .container_manager import ContainerManager
+from .executor import SandboxExecutor
+
+__all__ = ["ContainerManager", "SandboxExecutor"]
diff --git a/src/sandbox/container_manager.py b/src/sandbox/container_manager.py
new file mode 100644
index 0000000..2c87ea2
--- /dev/null
+++ b/src/sandbox/container_manager.py
@@ -0,0 +1,174 @@
+"""Docker container management for secure sandbox execution."""
+
+import docker
+import logging
+from typing import Dict, List, Optional, Any
+from docker.models.containers import Container
+
+logger = logging.getLogger(__name__)
+
+
+class ContainerManager:
+    """Manages Docker containers with security hardening for sandbox execution."""
+
+    def __init__(self):
+        """Initialize Docker client."""
+        try:
+            self.client = docker.from_env()
+            self.client.ping()
+        except Exception as e:
+            logger.error(f"Failed to connect to Docker: {e}")
+            raise
+
+    def create_container(
+        self,
+        image: str = "python:3.11-slim",
+        runtime_configs: Optional[Dict[str, Any]] = None,
+    ) -> Container:
+        """
+        Create a secure Docker container with security hardening.
+
+        Args:
+            image: Docker image to use
+            runtime_configs: Additional runtime configuration
+
+        Returns:
+            Created container object
+        """
+        configs = runtime_configs or {}
+
+        # Security hardening defaults
+        security_opts = configs.get("security_opt", ["no-new-privileges"])
+        cap_drop = configs.get("cap_drop", ["ALL"])
+        read_only = configs.get("read_only", True)
+        user = configs.get("user", "1000:1000")  # Non-root user
+        network_mode = configs.get("network_mode", "none")
+
+        # Resource limits
+        mem_limit = configs.get("mem_limit", "1g")
+        cpu_count = configs.get("cpu_count", 2)
+        pids_limit = configs.get("pids_limit", 100)
+
+        container = self.client.containers.create(
+            image=image,
+            security_opt=security_opts,
+            cap_drop=cap_drop,
+            read_only=read_only,
+            user=user,
+            network_mode=network_mode,
+            mem_limit=mem_limit,
+            cpu_count=cpu_count,
+            pids_limit=pids_limit,
+            detach=True,
+            remove=False,
+        )
+
+        logger.info(f"Created secure container {container.id[:12]}")
+        return container
+
+    def run_command(
+        self, container: Container, command: List[str], timeout: Optional[int] = 120
+    ) -> Dict[str, Any]:
+        """
+        Execute command in container with timeout.
+
+        Args:
+            container: Container to run command in
+            command: Command to execute
+            timeout: Timeout in seconds
+
+        Returns:
+            Execution result with output and metadata
+        """
+        try:
+            # Start container if not running
+            if container.status != "running":
+                container.start()
+
+            # Execute command
+            result = container.exec_run(cmd=command, timeout=timeout, demux=True)
+
+            return {
+                "exit_code": result.exit_code,
+                "stdout": result.output[0].decode("utf-8") if result.output[0] else "",
+                "stderr": result.output[1].decode("utf-8") if result.output[1] else "",
+                "exec_id": result.id,
+            }
+
+        except Exception as e:
+            logger.error(f"Command execution failed: {e}")
+            return {"exit_code": -1, "stdout": "", "stderr": str(e), "exec_id": None}
+
+    def get_container_stats(self, container: Container) -> Dict[str, Any]:
+        """
+        Get real-time resource statistics for container.
+
+        Args:
+            container: Container to get stats for
+
+        Returns:
+            Resource usage statistics
+        """
+        try:
+            stats = container.stats(stream=False)
+
+            # CPU usage calculation
+            cpu_delta = (
+                stats["cpu_stats"]["cpu_usage"]["total_usage"]
+                - stats["precpu_stats"]["cpu_usage"]["total_usage"]
+            )
+            system_cpu_delta = (
+                stats["cpu_stats"]["system_cpu_usage"]
+                - stats["precpu_stats"]["system_cpu_usage"]
+            )
+            cpu_count = len(stats["cpu_stats"]["cpu_usage"]["percpu_usage"])
+            cpu_percent = (cpu_delta / system_cpu_delta) * cpu_count * 100.0
+
+            # Memory usage
+            memory_usage = stats["memory_stats"]["usage"]
+            memory_limit = stats["memory_stats"]["limit"]
+            memory_percent = (memory_usage / memory_limit) * 100.0
+
+            return {
+                "cpu_percent": round(cpu_percent, 2),
+                "memory_usage_mb": round(memory_usage / (1024 * 1024), 2),
+                "memory_limit_mb": round(memory_limit / (1024 * 1024), 2),
+                "memory_percent": round(memory_percent, 2),
+                "pids_current": stats.get("pids_stats", {}).get("current", 0),
+            }
+
+        except Exception as e:
+            logger.error(f"Failed to get container stats: {e}")
+            return {}
+
+    def cleanup_container(self, container: Container) -> bool:
+        """
+        Clean up container by stopping and removing it.
+
+        Args:
+            container: Container to cleanup
+
+        Returns:
+            True if cleanup successful
+        """
+        try:
+            if container.status == "running":
+                container.stop(timeout=5)
+            container.remove(force=True)
+            logger.info(f"Cleaned up container {container.id[:12]}")
+            return True
+        except Exception as e:
+            logger.error(f"Failed to cleanup container {container.id[:12]}: {e}")
+            return False
+
+    def list_containers(self, all_containers: bool = False) -> List[Container]:
+        """
+        List containers managed by this manager.
+
+        Args:
+            all_containers: Include stopped containers
+
+        Returns:
+            List of containers
+        """
+        return self.client.containers.list(all=all_containers)