diff --git a/src/posix/platform/radio.cpp b/src/posix/platform/radio.cpp
index 98f580a6f..00e2c1c9f 100644
--- a/src/posix/platform/radio.cpp
+++ b/src/posix/platform/radio.cpp
@@ -201,6 +201,8 @@ void Radio::Init(void)
 #endif // OPENTHREAD_CONFIG_PLATFORM_RADIO_COEX_ENABLE
 }
 
+void *Radio::GetSpinelInstance(void) { return &sRadioSpinel; }
+
 } // namespace Posix
 } // namespace ot
 
diff --git a/src/posix/platform/radio.hpp b/src/posix/platform/radio.hpp
index 1312cb450..6a3d54956 100644
--- a/src/posix/platform/radio.hpp
+++ b/src/posix/platform/radio.hpp
@@ -55,6 +55,14 @@ public:
      */
     void Init(void);
 
+    /**
+     * This method acts as an accessor to the spinel instance used by the radio.
+     *
+     * @returns A pointer to the radio's spinel interface instance.
+     *
+     */
+    static void *GetSpinelInstance(void);
+
 private:
     RadioUrl mRadioUrl;
 };