A SSC control method includes a condition satisfaction determination step of determining whether a vehicle can coast and a navigation information acquisition step of obtaining forward road information regarding a road section ahead of a current vehicle position when it is determined, in the condition satisfaction determination step, that the vehicle can coast. The method further includes a forward quick turn section determination step of determining whether a quick turn section exists in the road section ahead by using the forward road information obtained in the navigation information acquisition step, and an SSC entry step of controlling the vehicle to coast when it is determined in the forward quick turn section determination step that the quick turn section does not exist in the road section ahead.