Petersen spent nearly 20 years at Penn State.
Sowell follows his older brother Chase in transferring to Penn State.
The freshman did not get any playing time this season.
Hansen ran for 952 yards in the 2025 season.
Manske is the sixth former Iowa State player to transfer to Penn State, following fellow quarterback Rocco Becht.
Becht leaves Iowa State with 9,274 passing yards.