Intelligent Space is an environment in which a variety of sensors are distributed and installed. In this paper, the three tools to simulate Intelligent Space system, Environment Designer, Sensor Arranger and Simulation Runner are explained. They operate to make our simulator a powerful simulation platform for research and many other aims in Intelligent Space. In addition to simulation of the operation of Intelligent Space including information processing and mobile robot control, sensor arrangement is one of the main objectives of our platform. Beside of manual operation, amateur users are looking forward to more automatic functions. Because the arrangement of laser range finder is an important theme for Intelligent Space research, automatic laser range finder arrangement mode is proposed.