Sensor networks have emerged as fundamentally new tools for monitoring spatially distributed phenomena. They incorporate the most progressive ideas from several areas of research: computer networks, wireless communications, grid technologies, multiagent systems and network operating systems. In spite of great interest centered on sensor data processing and information fusion, the simulation of entire multisensor network remains very important for the optimal solution of many tasks relevant to joint data processing and data transmission between sensor nodes. The current state of development automation tools does not correspond to the contemporary needs of modern design. The main purpose of this paper is to outline the structure of a simulation tool for modeling dynamical self-organizing heterogeneous sensor networks. Focus is concentrated on different component modeling and data flow simulation in the sensor networks.