The 33-year-old was available on a free transfer after leaving DC United.
''Lloyd has been with us for a month or two now, training and getting fit. We wanted to have a look at him and he is a tricky right-winger, an attacking player,'' said Wimbledon manager Neal Ardley.
''Obviously, with us losing Cody we just felt we needed another player. What part he can play until the end of the season, is always tight, but he is on a short-term deal.
''We are hopeful he will get a bit of playing time for Alan Reeves (in the Under-23s) to get that sharpness back into his game and he may well be a big help for us in the remaining games.
“He’s certainly shown us in training that he has ability and he just needs to get the physical side of his game up to speed.''
Sam previously played for Charlton Athletic and Leeds United before moving to New York Red Bulls.
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