Disclosed are a method for a terminal transmitting positioning information in a wireless communication system supporting sidelink and a device therefor according to various embodiments. Disclosed are a method for a terminal transmitting positioning information and a device therefor, the method comprising the steps of: receiving, from a network or a transmission terminal, a positioning signal comprising N consecutive tones to which reference signals are mapped; measuring the phase difference between a reference signal, which is mapped to an anchor tone which is a reference among the N consecutive tones, and the reference signals respectively mapped to the remaining tones; and transmitting, to the network or the transmission terminal, positioning information comprising information relating to the measured phase difference, wherein the positioning information comprises information relating to the sum of the measured phase differences between the reference signals.