diff --git a/soc/arm/st_stm32/stm32wl/CMakeLists.txt b/soc/arm/st_stm32/stm32wl/CMakeLists.txt
index 80ba57ceb6b..40ff85ccbbe 100644
--- a/soc/arm/st_stm32/stm32wl/CMakeLists.txt
+++ b/soc/arm/st_stm32/stm32wl/CMakeLists.txt
@@ -6,3 +6,5 @@ zephyr_sources(soc.c)
 zephyr_sources_ifdef(CONFIG_PM
   power.c
   )
+
+zephyr_sources_ifdef(CONFIG_POWEROFF poweroff.c)
diff --git a/soc/arm/st_stm32/stm32wl/Kconfig.series b/soc/arm/st_stm32/stm32wl/Kconfig.series
index 58dcae421ba..066deab4e92 100644
--- a/soc/arm/st_stm32/stm32wl/Kconfig.series
+++ b/soc/arm/st_stm32/stm32wl/Kconfig.series
@@ -13,5 +13,6 @@ config SOC_SERIES_STM32WLX
 	select CPU_HAS_ARM_MPU
 	select CLOCK_CONTROL_STM32_CUBE if CLOCK_CONTROL
 	select HAS_PM
+	select HAS_POWEROFF
 	help
 	  Enable support for STM32WL MCU series
diff --git a/soc/arm/st_stm32/stm32wl/power.c b/soc/arm/st_stm32/stm32wl/power.c
index 5517ec1ff47..aaf43db4817 100644
--- a/soc/arm/st_stm32/stm32wl/power.c
+++ b/soc/arm/st_stm32/stm32wl/power.c
@@ -51,22 +51,6 @@ void pm_state_set(enum pm_state state, uint8_t substate_id)
 		LL_LPM_EnableDeepSleep();
 		k_cpu_idle();
 		break;
-	case PM_STATE_SOFT_OFF:
-		LL_PWR_ClearFlag_WU();
-		switch (substate_id) {
-		case 0:
-			LL_PWR_SetPowerMode(LL_PWR_MODE_STANDBY);
-			break;
-		case 1:
-			LL_PWR_SetPowerMode(LL_PWR_MODE_SHUTDOWN);
-			break;
-		default:
-			LOG_DBG("Unsupported power substate-id %u", substate_id);
-			return;
-		}
-		LL_LPM_EnableDeepSleep();
-		k_cpu_idle();
-		break;
 	default:
 		LOG_DBG("Unsupported power state %u", state);
 		break;
@@ -85,9 +69,6 @@ void pm_state_exit_post_ops(enum pm_state state, uint8_t substate_id)
 		/* need to restore the clock */
 		stm32_clock_control_init(NULL);
 		break;
-	case PM_STATE_SOFT_OFF:
-		/* Nothing to do. */
-		break;
 	default:
 		LOG_DBG("Unsupported power substate-id %u", state);
 		break;
diff --git a/soc/arm/st_stm32/stm32wl/poweroff.c b/soc/arm/st_stm32/stm32wl/poweroff.c
new file mode 100644
index 00000000000..05d516393ea
--- /dev/null
+++ b/soc/arm/st_stm32/stm32wl/poweroff.c
@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2023 Nordic Semiconductor ASA
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/kernel.h>
+#include <zephyr/sys/poweroff.h>
+#include <zephyr/toolchain.h>
+
+#include <stm32_ll_cortex.h>
+#include <stm32_ll_pwr.h>
+
+void z_sys_poweroff(void)
+{
+	LL_PWR_SetPowerMode(LL_PWR_MODE_SHUTDOWN);
+	LL_LPM_EnableDeepSleep();
+
+	k_cpu_idle();
+
+	CODE_UNREACHABLE;
+}