Williams is the top-rated quarterback in the class of 2021.
The quarterback had announced his intent to leave the program in early February.
Lewandowski racked up 2,804 yards and 28 touchdowns in 10 games for Wisconsin-La Crosse last season.
The Terps are left with Josh Jackson and Lance LeGendre as their lone scholarship quarterbacks.
The Spartans are looking to become bowl eligible, while the Terps want to finish the season on a high note.
While Locksley and the Terps are out of bowl contention, they're confident in the future of the program.
“We’ve still got a lot more to prove in the two games left.”
In the Terps' past five losses, their opponents have scored on at least their first two attempts.
The Buckeyes took a 42-0 lead into halftime.
Jones played sparingly at Ohio State but has developed into a key piece for the Terps.