diff --git a/ophyd_devices/sim/sim.py b/ophyd_devices/sim/sim.py
index 7c72f38..82ec4c4 100644
--- a/ophyd_devices/sim/sim.py
+++ b/ophyd_devices/sim/sim.py
@@ -2,9 +2,9 @@ from ophyd import Component as Cpt
 from ophyd import Device
 from ophyd import DynamicDeviceComponent as Dcpt
 
-from ophyd_devices.sim.sim_positioner import SimPositionerWithCommFailure  # noqa: F401
 from ophyd_devices.sim.sim_positioner import SimPositioner
 from ophyd_devices.sim.sim_signals import SetableSignal as SynSignal
+from ophyd_devices.sim.sim_test_devices import SimPositionerWithCommFailure  # noqa: F401
 
 
 class SynDeviceSubOPAAS(Device):
diff --git a/ophyd_devices/sim/sim_positioner.py b/ophyd_devices/sim/sim_positioner.py
index cc4fb2a..4633b65 100644
--- a/ophyd_devices/sim/sim_positioner.py
+++ b/ophyd_devices/sim/sim_positioner.py
@@ -254,17 +254,3 @@ class SimLinearTrajectoryPositioner(SimPositioner):
             st.set_exception(exc=exc)
         finally:
             self._set_sim_state(self.motor_is_moving.name, 0)
-
-
-class SimPositionerWithCommFailure(SimPositioner):
-    fails = Cpt(SetableSignal, value=0)
-
-    def move(self, value: float, **kwargs) -> DeviceStatus:
-        if self.fails.get() == 1:
-            raise RuntimeError("Communication failure")
-        if self.fails.get() == 2:
-            while not self._stopped:
-                ttime.sleep(1)
-            status = DeviceStatus(self)
-            status.set_exception(RuntimeError("Communication failure"))
-        return super().move(value, **kwargs)
diff --git a/ophyd_devices/sim/sim_test_devices.py b/ophyd_devices/sim/sim_test_devices.py
index 2be5e16..e7ed377 100644
--- a/ophyd_devices/sim/sim_test_devices.py
+++ b/ophyd_devices/sim/sim_test_devices.py
@@ -4,7 +4,11 @@ import time as ttime
 import numpy as np
 from bec_lib import messages
 from bec_lib.endpoints import MessageEndpoints
-from ophyd import Device, OphydObject, PositionerBase
+from ophyd import Component as Cpt
+from ophyd import Device, DeviceStatus, OphydObject, PositionerBase
+
+from ophyd_devices.sim.sim_positioner import SimPositioner
+from ophyd_devices.sim.sim_signals import SetableSignal
 
 
 class DummyControllerDevice(Device):
@@ -149,3 +153,21 @@ class SynFlyerLamNI(Device, PositionerBase):
 
         flyer = threading.Thread(target=produce_data, args=(self, metadata))
         flyer.start()
+
+
+class SimPositionerWithCommFailure(SimPositioner):
+    """
+    A simulated positioner that can be configured to fail on move.
+    """
+
+    fails = Cpt(SetableSignal, value=0)
+
+    def move(self, value: float, **kwargs) -> DeviceStatus:
+        if self.fails.get() == 1:
+            raise RuntimeError("Communication failure")
+        if self.fails.get() == 2:
+            while not self._stopped:
+                ttime.sleep(1)
+            status = DeviceStatus(self)
+            status.set_exception(RuntimeError("Communication failure"))
+        return super().move(value, **kwargs)