The Patriots will send the Falcons a second-round draft pick in exchange for the veteran pass-catcher.
Sanu, 30, has 33 receptions, 313 yards and a touchdown this season. He caught a career-high 838 yards last year, and four touchdowns on 66 catches in 16 starts. For his career, he's recorded 4,300 yards, 25 scores and 377 catches in 110 games. He also has two rushing touchdowns.
The Patriots next host the Cleveland Browns at 4:25 p.m. EDT Sunday at Gillette Stadium in Foxborough, Mass.