Is it ok to be baptized into another denomination if you were baptized already into the catholic church?

The answer to this question would depend on who you asked. From the general Christian perspective, if you were baptized when you DID NOT believe, you should - in obedience - get baptized again. This includes infant-baptism, or if you feel that you were too young to truly dedicate your life to Christ.

If you were baptized Catholic when you had given your life fully to Christ, there is no need to be baptized again; baptism is a symbol of being crucified and resurrected with Christ. You only need to die and be raised once.

If you were once Catholic, but are now interested in a different denomination, I would say that it all depends if you think you were a true believer in Christ at the time of baptism. The Roman Catholic church is certainly Christian and therefore fully-able to provide a righteous God-sanctioned baptism.