S.D. Codified Laws § 5-5-20
The lessee of any school or endowment lands may assign his lease to any third person; but before any such assignment of a lease is effective, the assignment shall be approved by the commissioner of school and public lands and a copy thereof filed by the commissioner. The commissioner shall prescribe the form to be used for such assignment and shall fix a reasonable fee for filing, recording and approval of it. The subletting of any school and endowment lands by the lessee thereof for profit is prohibited. Such subletting shall be cause for the forfeiture of the lease and shall render the lessee liable to the state for damages in double the amount of the difference between the lease rental and the amount paid or agreed to be paid from the sublessee.
SDCL 5-5-20