Tukak Sadai is a district of South Bangka Regency, Bangka-Belitung Islands.

The district is located in the southeastern section of Bangka Island, and contains the Sadai seaport.

Tukak Sadai was established on 14 December 2007, after being split off from the southeastern part of Toboali district.

The district is subdivided into five villages: Tukak, Sadai, Tiram, Pasir Putih and Bukit Terap.

[3] By July 2020, two Chinese companies - glass manufacturer Xinyi Solar and Sinomach - have signed agreements to construct factories in Sadai.