Martin made 39 appearances last season for Wealdstone who play in the Isthmian League Premiership, which is below the Blue Square Conference.
Steve Davis told the official club website "Neil (Baker) used his contacts at Wealdstone to get the lad up here and we have invited Carl to have a look at him. He is quick and strong and has good tricks. He has been really positive with his attitude and hasn't sat back and let anyone get the better of him. He has been aggressive and determined to show us what he can do.
"He has put himself about and has been very positive in everything he has done. He is very athletic and comes with a high reputation because he has done well for Wealdstone over the last few years."