Terms of the deal were not disclosed. The signing was reported earlier Monday by Yahoo! Sports.
Hoomanawanui, 25, played in 13 games for the Patriots last season, stepping into a larger role with Rob Gronkowski dealing with multiple injury issues. He caught 12 passes for 136 yards and one touchdown.
Hoomanawanui originally was signed by the Patriots during the 2012 season off the Washington Redskins' practice squad. He entered restricted free agency last offseason and was eventually re-signed by New England.
The Illinois product gives New England some insurance for Gronkowski, who continues to rehab from surgery to repair a torn ACL.
The Patriots are likely to continue to address the position this offseason, with only D.J. Williams on the roster besides Gronkowski and Hoomanawanui.