Yes.
If you complete the online Catamaran course ($27) and log at least 3 days as skipper or 7 days as crew on a 38 ft (11.5m) or greater sized catamaran, you will be awarded a valid catamaran qualification on your SLC document. To upgrade this to a Catamaran Endorsement, simply additionally do an assessment of catamaran skills on the water with a Catamaran qualified SLC assessor.