 Being part of Phanom Sarakham District, on 6 January 1966 the three "tambons", Khu Yai Mi, Tha Kradan, and Tha Takiap, were split off to form the minor district ("king amphoe") Sanam Chai (สนามไชย).It was renamed Sanam Chai Ket on 14 December 1972, and upgraded to a full district on 28 June 1973.Neighboring districts are (from the west clockwise)