Wireless body area network (WBAN) is a wireless network similar to wireless sensor network (WSN). The WBAN uses body sensor to transmit and received wireless communication. The WBAN has recently emerged as one of the premier research topics in enhancing healthcare industry. However, since WBAN requires it to be a low powered sensor node, it will be extremely difficult to put through any advanced security mechanism due to the restriction of power use in WBAN devices. Therefore, this research proposed a different approach in securing WBAN. This research is designed to assess the confidentiality, integrity and availability of WBAN and measure the attack perimeter of the WBAN implementation, using a practical security assessment (PSA). In this paper, the idea of conducting PSA before designing WBAN security solution will be used. The WBAN security solution aimed to enhance the physical security of the WBAN by developing a Secure Zone for WBAN.