S.D. Codified Laws § 58-30-175
No insurance producer or business entity may act as an agent of an insurer unless the insurance producer becomes an appointed insurance producer of that insurer. An insurance producer who is not acting as an agent of an insurer is not required to become appointed. This section does not apply to property and casualty insurance producers who sell, solicit, or negotiate and place insurance with admitted insurers although the insurance producer is not appointed with the insurer if all insurance business placed by the unappointed insurance producer is through a licensed insurance producer who is appointed by the insurer involved in the transaction and if the coverage is not reasonably available through the insurance producer's existing appointed insurers for placements made as authorized by this section. The unappointed insurance producer may receive compensation from the insurer or a resident appointed insurance producer.
SDCL 58-30-175