A simulation apparatus and method in relation to a sensor network are provided. The apparatus includes: a space database storing space information; a database storing standard specifications of sensors or sensor nodes; and a modeling unit extracting information on a 3-dimensional (3D) virtual space in which a sensor or sensor node is positioned, from the space database, obtaining the characteristic of the sensor or the sensor node from the standard specification based on the extracted space information and the standard specification of the sensor or the sensor node, and modeling the sensor or the sensor node. According to the apparatus and method, a virtual wireless sensor network system identical to a real world environment can be established, and as a result, the performance of the system can be accurately measured and an optimized design of the system can be efficiently performed.