The Reds had been due to face the Black Cats at Carrington but the match has been pushed back to Saturday 10 May.
It will kick off at 12:00 BST and the venue remains as our training base.
United won the reverse fixture in the north east, 4-3 in October, thanks to a late winner by Jim Thwaites.
As the international break comes to an end, the squad's full focus can be trained on Monday night's FA Youth Cup semi-final, away to Aston Villa.
Tickets are available for the Villa Park encounter, as Adam Lawrence's side look to continue the push for silverware in the prestigious competition.