The nine-year vet did not perform up to expectation in his short stint in Philadelphia, posting 10 tackles in eight games.
The 32-year old was inked to a three-year, $11 million deal this offseason that included a $2.75 million signing bonus. His $1 million base salary this season is fully guaranteed, as is $1 million of his base next season.
Sopoaga was a steady player up front for San Francisco over his first eight NFL seasons, and looked like he would be a necessary piece for Bill Davis as he transitioned the defense to a two-gap 3-4, but had less of an impact than anticipated.
He saw a season-high 47 snaps this past week against the Giants as the defense played base for much of the game.
The Sopoaga trade means an increased workload for rookie Bennie Logan, whom the organization is high on. Fellow rookie Damion Square is listed as the backup nose guard on the Eagles' unofficial depth chart.