S.D. Codified Laws § 58-20-12
Every policy written insuring against the liability of employers for personal injuries, other than payment of compensation under the provisions of the title, Workers' Compensation, shall contain provisions to the effect that the insurer shall be directly liable to the injured party, and, in the event of his death, to the party entitled to sue therefor, to pay him the amount of damages for which such insured is liable. Such injured party, or, in the event of his death, the party entitled to sue therefor, in his suit against the insured, may join the insurer as a defendant, in which case judgment shall bind either or both the insured and the insurer, or such injured party, or in the event of his death, the party entitled to sue therefor, after having obtained judgment against the insured alone, may proceed on such judgment in a separate claim against such insurer; but payment of such liability, in whole or in part, by either the insured or the insurer shall, to the extent thereof, be a bar to recovery against the other of the amount so paid. In no case shall the insurer be liable for damages beyond the face amount of the policy.
SDCL 58-20-12