The Washington Nationals sold the contract of infielder Jamey Carroll to the Colorado Rockies yesterday and also prepared to make their final pitch to free agent slugger Sammy Sosa. Carroll, a member of the Nationals' organization his entire career and one of the most popular players in the clubhouse, was sold to the Rockies for $300,000. General manager Jim Bowden said the offseason additions of infielders Marlon Anderson, Damian Jackson and Royce Clayton (the latter to a minor league deal) and the emergence of minor leaguer Brendan Harris left Carroll a long shot to make the club out of spring training.