The full-back was a regular in our Under-21s side last term, making 15 appearances in total, and scoring in the Premier League 2 play-off victory over West Ham United last month.
As he was available on a free transfer, the defender has been snapped up by Carlisle, who were unable to avoid relegation to the National League but are already rated among the favourites to win that division and bounce straight back up.
The Cumbrians are managed by Old Trafford legend Mark Hughes, who was pleased to confirm the signing on the club's official website.
"We're delighted that Sam is joining us," said the Welshman.