After his previous deal expired in the summer, Kimpioka has signed a new one-year contract, with the option of another.
The Black Cats youngster has not taken part in the pre-season programme as talks over his situation continued, and is likely going to have to build his match fitness before he considered for first-team selection.
Sunderland boss Phil Parkinson says it is now up to the Swedish youth international to push his way into the first-team picture.
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"We’re very pleased that Benji’s contract situation has been resolved,” Parkinson said.
"Now, it’s up to him to work hard and push his way into the first-team picture.”
Kimpioka has not made a senior appearance for the Black Cats since November 26, 2019.
The 20-year-old will have to battle the likes of Dan Neil for more action in the coming months.