| Official Name: | San Sai |
| Native Name: | สันทราย |
| Settlement Type: | Tambon |
| Subdivision Type: | Country |
| Subdivision Name: | Thailand |
| Subdivision Type2: | Province |
| Subdivision Name2: | Chiang Rai |
| Subdivision Type3: | District |
| Subdivision Name3: | Mae Chan |
| Population As Of: | 2005 |
| Population Total: | 2,419 |
| Timezone: | ICT |
| Utc Offset: | +7 |
San Sai, Mae Chan (th|สันทราย) is a village and tambon (subdistrict) of Mae Chan District, in Chiang Rai Province, Thailand.[1] In 2005 it had a population of 2,419 people. The tambon contains nine villages.