The sensor network service has emerged as a new technical research area. The sensor network service provides useful functions to the user by sensing the condition of physical entities. One important issue that is rarely addressed by current studies on the sensor network service is that they only use sensor-derived data to achieve local service goals. However, once external users can discover globally deployed sensor networks, the information which is created by such networks will be more expansible to various novel services. Recently, few studies have addressed the importance of sensor-derived data sharing, but they have not shown deep concern about ways to share sensor-derived data with external users. This paper proposes the sensor network registry for the sensor network registration and discovery. We explore the information that the sensor network registry should maintain in order to enable sensor network services to be shared, and also design the architecture of the system. We expect the sensor network registry will make sensor network technology more useful, just as a good Web search engine makes the Internet more useful.