diff --git a/tests/components/sonos/conftest.py b/tests/components/sonos/conftest.py
index c6230eb9344..6831e4139c2 100644
--- a/tests/components/sonos/conftest.py
+++ b/tests/components/sonos/conftest.py
@@ -167,6 +167,17 @@ async def async_autosetup_sonos(async_setup_sonos):
     await async_setup_sonos()
 
 
+def reset_sonos_alarms(alarm_event: SonosMockEvent) -> None:
+    """Reset the Sonos alarms to a known state."""
+    sonos_alarms = Alarms()
+    sonos_alarms.alarms = {}
+    sonos_alarms._last_zone_used = None
+    sonos_alarms._last_alarm_list_version = None
+    sonos_alarms.last_uid = None
+    sonos_alarms.last_id = 0
+    alarm_event.variables["alarm_list_version"] = "RINCON_test:0"
+
+
 @pytest.fixture
 def async_setup_sonos(
     hass: HomeAssistant, config_entry: MockConfigEntry, fire_zgs_event, alarm_event
@@ -175,9 +186,7 @@ def async_setup_sonos(
 
     async def _wrapper():
         config_entry.add_to_hass(hass)
-        sonos_alarms = Alarms()
-        sonos_alarms.last_alarm_list_version = "RINCON_test:0"
-        alarm_event.variables["alarm_list_version"] = "RINCON_test:0"
+        reset_sonos_alarms(alarm_event)
         assert await hass.config_entries.async_setup(config_entry.entry_id)
         await hass.async_block_till_done(wait_background_tasks=True)
         await fire_zgs_event()
@@ -851,11 +860,15 @@ def zgs_event_fixture(
 
 @pytest.fixture(name="sonos_setup_two_speakers")
 async def sonos_setup_two_speakers(
-    hass: HomeAssistant, soco_factory: SoCoMockFactory
+    hass: HomeAssistant,
+    soco_factory: SoCoMockFactory,
+    alarm_event: SonosMockEvent,
 ) -> list[MockSoCo]:
     """Set up home assistant with two Sonos Speakers."""
     soco_lr = soco_factory.cache_mock(MockSoCo(), "10.10.10.1", "Living Room")
     soco_br = soco_factory.cache_mock(MockSoCo(), "10.10.10.2", "Bedroom")
+    reset_sonos_alarms(alarm_event)
+
     await async_setup_component(
         hass,
         DOMAIN,
diff --git a/tests/components/sonos/test_switch.py b/tests/components/sonos/test_switch.py
index f72abc36470..f2dd3478a90 100644
--- a/tests/components/sonos/test_switch.py
+++ b/tests/components/sonos/test_switch.py
@@ -271,8 +271,6 @@ async def test_alarm_create_delete(
 
 async def test_alarm_change_device(
     hass: HomeAssistant,
-    async_setup_sonos,
-    soco: MockSoCo,
     alarm_clock: SonosMockService,
     alarm_clock_extended: SonosMockService,
     alarm_event: SonosMockEvent,
@@ -294,7 +292,7 @@ async def test_alarm_change_device(
     alarm_dict["CurrentAlarmList"] = alarm_dict["CurrentAlarmList"].replace(
         "RINCON_test", f"{soco_lr.uid}"
     )
-    alarm_dict["CurrentAlarmListVersion"] = f"{soco_lr.uid}:900"
+    alarm_dict["CurrentAlarmListVersion"] = "RINCON_test:900"
     soco_lr.alarmClock.ListAlarms.return_value = alarm_dict
     soco_br = soco_factory.cache_mock(MockSoCo(), "10.10.10.2", "Bedroom")
     await async_setup_component(
@@ -327,7 +325,7 @@ async def test_alarm_change_device(
     alarm_clock.ListAlarms.return_value = alarm_update
 
     # Update the alarm_list_version so it gets processed.
-    alarm_event.variables["alarm_list_version"] = f"{soco_br.uid}:1000"
+    alarm_event.variables["alarm_list_version"] = "RINCON_test:1000"
     alarm_update["CurrentAlarmListVersion"] = alarm_event.increment_variable(
         "alarm_list_version"
     )