Carson made only four appearances in the 2005–06 season, all in cup competitions, and in March 2006, was allowed to move to Sheffield Wednesday on loan. Wednesday sought his services to help solve their goalkeeping crisis, while Carson was looking to gain more first team experience and to challenge for a place in the England 2006 FIFA World Cup squad. He kept five clean sheets in nine appearances for Wednesday, whose assistant manager Kevin Summerfield hailed his contribution as a key factor in helping the club escape relegation. He returned to Liverpool at the end of the season and in July 2006, extended his contract with Liverpool until 2011.