The present invention provides a method for transmitting an uplink signal to a base station by a terminal in a wireless communication system supporting an unlicensed band, and a device supporting the same. More particularly, the present invention provides a method for transmitting an uplink signal through an LBT method of a terminal and a plurality of unlicensed component carriers on the basis of the LBT method when two or more unlicensed component carriers among the plurality of unlicensed component carriers are included in different timing advance groups (TAGs) in a wireless communication system supporting the plurality of unlicensed component carriers, and a device supporting the same.