Mobile sensor networks (MSNs) are networks where nodes are dynamic and communicate with each other in wireless form. Many researchers focus on designing proper routing and energy conservation schemes for MSNs. However, for group authentication and local information upload in MSNs, a proper region division scheme is necessary. In this paper, we design a region division scheme based on intelligent agent which evaluates trustworthiness of nodes for MSNs. The trustworthiness evaluation is performed according to the important data collected by sensors on nodes. Taking vehicular networks as an example, some parameters, such as remaining gasoline and total mileage, determine the trustworthiness of a vehicle as a node in its network. The simulation indicates that our proposed scheme can achieve appropriate region division and packet delivery ratio with reasonable overhead and delay.