diff --git a/sysbuild/Kconfig.netcore b/sysbuild/Kconfig.netcore
index bae87cb06a0e..6254121c2a2b 100644
--- a/sysbuild/Kconfig.netcore
+++ b/sysbuild/Kconfig.netcore
@@ -13,11 +13,11 @@ config EXTERNAL_CONFIGURED_NETCORE
 
 config SUPPORT_NETCORE
 	bool
-	default y if (SOC_NRF5340_CPUAPP || SOC_NRF54H20_CPUAPP)
+	default y if (SOC_NRF5340_CPUAPP || SOC_NRF54H20_CPUAPP || BOARD_NRF5340BSIM_NRF5340_CPUAPP)
 
 config NETCORE_REMOTE_BOARD_TARGET_CPUCLUSTER
 	string
-	default "cpunet" if SOC_NRF5340_CPUAPP
+	default "cpunet" if (SOC_NRF5340_CPUAPP || BOARD_NRF5340BSIM_NRF5340_CPUAPP)
 	default "cpurad" if SOC_NRF54H20_CPUAPP
 
 config NETCORE_REMOTE_DOMAIN
diff --git a/sysbuild/netcore.cmake b/sysbuild/netcore.cmake
index 58447baa6614..c30dcd26757f 100644
--- a/sysbuild/netcore.cmake
+++ b/sysbuild/netcore.cmake
@@ -74,4 +74,10 @@ if(SB_CONFIG_SUPPORT_NETCORE AND NOT SB_CONFIG_NETCORE_NONE AND DEFINED SB_CONFI
   endif()
 
   set_property(GLOBAL PROPERTY PM_DOMAINS ${PM_DOMAINS})
+
+  if(SB_CONFIG_BOARD_NRF5340BSIM_NRF5340_CPUAPP)
+    native_simulator_set_child_images(${DEFAULT_IMAGE} ${SB_CONFIG_NETCORE_IMAGE_NAME})
+    native_simulator_set_primary_mcu_index(${DEFAULT_IMAGE} ${SB_CONFIG_NETCORE_IMAGE_NAME})
+    native_simulator_set_final_executable(${DEFAULT_IMAGE})
+  endif()
 endif()
diff --git a/tests/bluetooth/bsim/nrf_auraconfig/Kconfig.sysbuild b/tests/bluetooth/bsim/nrf_auraconfig/Kconfig.sysbuild
index 93ab4f730432..8aade27ef08f 100644
--- a/tests/bluetooth/bsim/nrf_auraconfig/Kconfig.sysbuild
+++ b/tests/bluetooth/bsim/nrf_auraconfig/Kconfig.sysbuild
@@ -6,10 +6,9 @@
 
 source "share/sysbuild/Kconfig"
 
-config NET_CORE_BOARD
-	string
-	default "nrf5340bsim/nrf5340/cpunet" if $(BOARD_TARGET_STRING) = "NRF5340BSIM_NRF5340_CPUAPP"
-
+config NRF_DEFAULT_IPC_RADIO
+	bool
+	default y
 
 config NATIVE_SIMULATOR_PRIMARY_MCU_INDEX
 	int
diff --git a/tests/bluetooth/bsim/nrf_auraconfig/sysbuild.cmake b/tests/bluetooth/bsim/nrf_auraconfig/sysbuild.cmake
deleted file mode 100644
index 231f18719643..000000000000
--- a/tests/bluetooth/bsim/nrf_auraconfig/sysbuild.cmake
+++ /dev/null
@@ -1,27 +0,0 @@
-#
-# Copyright (c) 2024 Nordic Semiconductor ASA
-#
-# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
-#
-
-if(NOT("${SB_CONFIG_NET_CORE_BOARD}" STREQUAL ""))
-	set(NET_APP ipc_radio)
-	set(NET_APP_SRC_DIR ${ZEPHYR_BASE}/../nrf/applications/${NET_APP})
-
-	ExternalZephyrProject_Add(
-		APPLICATION ${NET_APP}
-		SOURCE_DIR  ${NET_APP_SRC_DIR}
-		BOARD       ${SB_CONFIG_NET_CORE_BOARD}
-	)
-
-	set(${NET_APP}_CONF_FILE
-	${NET_APP_SRC_DIR}/overlay-bt_hci_ipc.conf
-	prj.conf
-	CACHE INTERNAL "")
-
-	native_simulator_set_primary_mcu_index(${DEFAULT_IMAGE} ${NET_APP})
-
-	native_simulator_set_child_images(${DEFAULT_IMAGE} ${NET_APP})
-endif()
-
-native_simulator_set_final_executable(${DEFAULT_IMAGE})
diff --git a/tests/bluetooth/bsim/nrf_auraconfig/tester/Kconfig.sysbuild b/tests/bluetooth/bsim/nrf_auraconfig/tester/Kconfig.sysbuild
index 93ab4f730432..8aade27ef08f 100644
--- a/tests/bluetooth/bsim/nrf_auraconfig/tester/Kconfig.sysbuild
+++ b/tests/bluetooth/bsim/nrf_auraconfig/tester/Kconfig.sysbuild
@@ -6,10 +6,9 @@
 
 source "share/sysbuild/Kconfig"
 
-config NET_CORE_BOARD
-	string
-	default "nrf5340bsim/nrf5340/cpunet" if $(BOARD_TARGET_STRING) = "NRF5340BSIM_NRF5340_CPUAPP"
-
+config NRF_DEFAULT_IPC_RADIO
+	bool
+	default y
 
 config NATIVE_SIMULATOR_PRIMARY_MCU_INDEX
 	int
diff --git a/tests/bluetooth/bsim/nrf_auraconfig/tester/sysbuild.cmake b/tests/bluetooth/bsim/nrf_auraconfig/tester/sysbuild.cmake
deleted file mode 100644
index 231f18719643..000000000000
--- a/tests/bluetooth/bsim/nrf_auraconfig/tester/sysbuild.cmake
+++ /dev/null
@@ -1,27 +0,0 @@
-#
-# Copyright (c) 2024 Nordic Semiconductor ASA
-#
-# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
-#
-
-if(NOT("${SB_CONFIG_NET_CORE_BOARD}" STREQUAL ""))
-	set(NET_APP ipc_radio)
-	set(NET_APP_SRC_DIR ${ZEPHYR_BASE}/../nrf/applications/${NET_APP})
-
-	ExternalZephyrProject_Add(
-		APPLICATION ${NET_APP}
-		SOURCE_DIR  ${NET_APP_SRC_DIR}
-		BOARD       ${SB_CONFIG_NET_CORE_BOARD}
-	)
-
-	set(${NET_APP}_CONF_FILE
-	${NET_APP_SRC_DIR}/overlay-bt_hci_ipc.conf
-	prj.conf
-	CACHE INTERNAL "")
-
-	native_simulator_set_primary_mcu_index(${DEFAULT_IMAGE} ${NET_APP})
-
-	native_simulator_set_child_images(${DEFAULT_IMAGE} ${NET_APP})
-endif()
-
-native_simulator_set_final_executable(${DEFAULT_IMAGE})