In recent years, wireless sensor networks offer cost-effective solutions to various surveillance and tracking applications with the developments in sensor techniques. In many of these applications, sensor nodes that are equipped with directional sensors and they operate autonomously in unattended environments. The deployment strategy of directional sensor nodes is critical to improve target detection and tracking accuracy. In this paper, deployment of passive infrared motion (PIR) sensors is analyzed in terms of coverage issue. A PIR Sensor Deployment (PSD) problem is addressed using deployment schemes that are based on computational geometry. Finally, the performance of deployment schemes is evaluated in a Java based simulation environment.