This draft Recommendation specifies the software-defined networking (SDN) based quantum key distribution network (QKDN) interworking control between QKDN providers. It provides an overview of the role of SDN control for the interworking between QKDN providers, the functional requirements for SDN controller for the interworking, the functional entities of SDN controller for the interworking, the interfaces of SDN controller for the interworking, the operational procedures of SDN controller for the interworking, and the security considerations.