Sai Thong Watthana (Thai: ทรายทองวัฒนา, pronounced [sāːj tʰɔ̄ːŋ wát.tʰā.nāː]) is a district (amphoe) of Kamphaeng Phet province, central Thailand.

Neighbouring districts are (from the south clockwise): Bueng Samakkhi, Khlong Khlung, and Sai Ngam of Kamphaeng Phet Province; and Sam Ngam of Phichit province.

The minor district (king amphoe) was established on 1 April 1992 by splitting off three tambons from Khlong Khlung district.

[3] The district Sai Thong Watthana is subdivided into 3 subdistricts (Tambon), which are further subdivided into 38 administrative villages (Muban).

This Kamphaeng Phet Province location article is a stub.