Huai Sai (Thai: ห้วยทราย) is a tambon (subdistrict) of San Kamphaeng District, in Chiang Mai Province, Thailand.

In 2020, it had a total population of 5,964 people.

[1] The tambon is subdivided into 8 administrative villages (muban).

The whole area of the subdistrict is covered by the subdistrict municipality (Thesaban Tambon) Huai Sai (เทศบาลตำบลห้วยทราย).

This Chiang Mai province location article is a stub.