S.D. Codified Laws § 36-18A-42
A person or business entity may reinstate an expired license or request inactive status within three years after a license's date of expiration if the person or business entity is otherwise qualified. The fee for the reinstatement of the license or requesting inactive status after it has expired shall be increased by an amount to be determined by the board in rules promulgated pursuant to chapter 1-26. A person requesting reinstatement of an expired or inactive license shall complete the requirements for continuing professional development and any reexaminations and pay any penalty fees. If a person or business entity fails to reinstate an expired license or request inactive status within the three years after the date of expiration, all relevant files shall be destroyed. A person or business entity requesting licensure after three years shall submit an application for a new license. A person or business entity shall retain the person's or business entity's original license number.
SDCL 36-18A-42