S.D. Codified Laws § 36-31A-7

Active duty military personnel, or the spouse of such a service member, shall designate a home state in which the individual has a current license in good standing. The individual may retain the home state designation during the period the service member is on active duty. Subsequent to designating a home state, the individual may change the home state only through application for licensure in the new state or through the process described in § 36-31A-6.