Wireless Sensor Networks (WSNs) has emerged among different wireless technologies sharing the ISM spectrum band. In most cases the networks were stationary but as an evolutionary step the WSNs have to consider mobility. To share communication channel the establishment of a MAC protocol is required in the sensor nodes. In this paper, the authors have studied the mobility of sensor nodes, using OMNET++ Network simulator. Although OMNET++ provides a powerful and clear simulation framework, it lacks of direct support and a concise modeling chain for wireless communication.