The traditional static Lambert and non Lambert beam configuration is difficult to solve the problem of limited transmitter site. Aiming at the application scenario of a single transmitter, a coverage method of restricted visible light communication based on sectionalized optical beam switching is proposed. This method uses commercially available slanted non-Lambert optical beams to dynamically determine the candidate optical beams that can provide the best coverage signal-to-noise ratio according to the state information feedback from the receiver at different locations, and then builds a directional transmission link. Simulation results show that, compared with the traditional static Lambert beam configuration, the proposed method can achieve an average SNR gain of 4.48 dB and 5.94 dB respectively, by adding two or three candidate sector beam switching options in a typical indoor environment.