Ross Stewart's sixth goal in five games helped Sunderland secure a point at struggling Blackpool, who had Callum Connolly sent off late on.
Scotland striker Stewart, who now has a goal in each of his four matches since returning from a troublesome thigh injury, glanced in Trai Hume's header to level at Bloomfield Road.
Shayne Lavery opened the scoring for Blackpool in the first half when he galloped onto a pass from CJ Hamilton and fired past Anthony Patterson.
Amad Diallo hit the crossbar, as did Stewart before his leveller, and it proved a nervy finish for the 10-man Seasiders once Connolly went off for a second bookable offence in added time.