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IP based Wireless Sensor Networks (IP-WSN) are gaining importance for its broad range of applications in health-care, home automation, environmental monitoring, security & safety and industrial automation. In all of these applications mobility in sensor network with special attention to energy efficiency is a major issue to be addressed. Host based mobility management protocol is inherently unsuitable for energy inefficient IPWSN. So network-based mobility management protocol can be an alternative to the mobility supported IP-WSN. In this paper we propose a mobility supported IP-WSN protocol based on PMIPv6 called Sensor Proxy Mobile IPv6 (SPMIPv6). We present its architecture, message formats and also analyze its performance considering signaling cost and mobility cost. Our analyses show that the proposed scheme reduces the signaling cost by 67% and 60% as well as reduces mobility cost by 55% and 60% with comparison to MIPv6 and PMIPv6 respectively.