diff --git a/tests/unit/vertexai/genai/replays/test_get_agent_engine_sandbox.py b/tests/unit/vertexai/genai/replays/test_get_agent_engine_sandbox.py
index b82a74a397..b5029897b7 100644
--- a/tests/unit/vertexai/genai/replays/test_get_agent_engine_sandbox.py
+++ b/tests/unit/vertexai/genai/replays/test_get_agent_engine_sandbox.py
@@ -38,6 +38,7 @@ def test_get_sandbox(client):
     )
     assert isinstance(sandbox, types.SandboxEnvironment)
     assert sandbox.name == operation.response.name
+    assert isinstance(sandbox.state, types.SandboxState)
 
 
 pytestmark = pytest_helper.setup(
diff --git a/vertexai/_genai/types/__init__.py b/vertexai/_genai/types/__init__.py
index 4182fbbd8c..05e83628b3 100644
--- a/vertexai/_genai/types/__init__.py
+++ b/vertexai/_genai/types/__init__.py
@@ -1179,6 +1179,7 @@
 from .common import SandboxEnvironmentTemplateWarmPoolConfig
 from .common import SandboxEnvironmentTemplateWarmPoolConfigDict
 from .common import SandboxEnvironmentTemplateWarmPoolConfigOrDict
+from .common import SandboxState
 from .common import SavedQuery
 from .common import SavedQueryDict
 from .common import SavedQueryOrDict
@@ -2641,6 +2642,7 @@
     "Operator",
     "Language",
     "MachineConfig",
+    "SandboxState",
     "Protocol",
     "DefaultContainerCategory",
     "PostSnapshotAction",
diff --git a/vertexai/_genai/types/common.py b/vertexai/_genai/types/common.py
index 6ce66a054c..61d3b99cec 100644
--- a/vertexai/_genai/types/common.py
+++ b/vertexai/_genai/types/common.py
@@ -324,6 +324,23 @@ class MachineConfig(_common.CaseInSensitiveEnum):
     """The default value: milligcu 4000, memory 4 Gib"""
 
 
+class SandboxState(_common.CaseInSensitiveEnum):
+    """Output only. The runtime state of the SandboxEnvironment."""
+
+    STATE_UNSPECIFIED = "STATE_UNSPECIFIED"
+    """The default value. This value is unused."""
+    STATE_PROVISIONING = "STATE_PROVISIONING"
+    """Runtime resources are being allocated for the sandbox environment."""
+    STATE_RUNNING = "STATE_RUNNING"
+    """Sandbox runtime is ready for serving."""
+    STATE_DEPROVISIONING = "STATE_DEPROVISIONING"
+    """Sandbox runtime is halted, performing tear down tasks."""
+    STATE_TERMINATED = "STATE_TERMINATED"
+    """Sandbox has terminated with underlying runtime failure."""
+    STATE_DELETED = "STATE_DELETED"
+    """Sandbox runtime has been deleted."""
+
+
 class Protocol(_common.CaseInSensitiveEnum):
     """Protocol for port. Defaults to TCP if not specified."""
 
@@ -12356,7 +12373,7 @@ class SandboxEnvironment(_common.BaseModel):
         default=None,
         description="""Optional. The configuration of the SandboxEnvironment.""",
     )
-    state: Optional[State] = Field(
+    state: Optional[SandboxState] = Field(
         default=None,
         description="""Output only. The runtime state of the SandboxEnvironment.""",
     )
@@ -12408,7 +12425,7 @@ class SandboxEnvironmentDict(TypedDict, total=False):
     spec: Optional[SandboxEnvironmentSpecDict]
     """Optional. The configuration of the SandboxEnvironment."""
 
-    state: Optional[State]
+    state: Optional[SandboxState]
     """Output only. The runtime state of the SandboxEnvironment."""
 
     ttl: Optional[str]