Can I sue the boys and girls club for the false allegations they told cps? My case is closed and all allegations where in fact found false.

You would probably have a hard time bringing a claim against the Boys and Girls Club because of the state's over-arching policy to protect children. People who work with children have a duty to report suspected child abuse or neglect. If those same people could be easily sued for defamation, it would be impossible to require mandatory reporting of suspected abuse or neglect. If the issue comes up, you can show the CPS records that show there was no abuse or neglect found in the case. However, it is futile to try to sue teachers and other child care workers for defamation when they report as required.