Disclosed, according to various embodiments, are a method for a UE transmitting a sidelink signal in a wireless communication system supporting a sidelink, and a device therefor. Disclosed is a method for transmitting a sidelink signal and a device therefor, the method comprising the steps of: measuring state information including mobility information; receiving a first sidelink signal including control information; and determining whether to transmit a second sidelink signal, wherein, on the basis of the control information, including information on a cluster area, and the state information, including information on a location included in the cluster area, a UE monitors the receiving or not of a third sidelink signal transmitted by other UEs during a predetermined duration, and whether to transmit the second sidelink signal is determined on the basis of the result of the monitoring.