Wang Sai () is a tambon (subdistrict) of Pak Chong District, in Nakhon Ratchasima Province, Thailand. In 2020 it had a total population of 11,431 people.
The subdistrict was created effective August 1, 1984 by splitting off 5 administrative villages from Nong Sarai.
The tambon is subdivided into 18 administrative villages (muban).
The whole area of the subdistrict is covered by the subdistrict municipality (Thesaban Tambon) Wang Sai (à ¹Âà ¸Âà ¸¨à ¸Âà ¸²à ¸¥à ¸Âà ¸³à ¸Âà ¸¥à ¸§à ¸±à ¸Âà ¹Âà ¸Âà ¸£).