General synonyms:
* Ironical
* Sardonic
* Wry
* Snide
* Caustic
* Acerbic
* Mocking
* Taunting
* Cynical
More specific synonyms:
* Facetious: playfully humorous, often with a hint of sarcasm.
* Ironic: implying the opposite of what is said, often with a humorous or bitter edge.
* Satirical: using humor to expose and criticize something.
* Bittersweet: expressing both sadness and happiness.
* Cutting: sharp and hurtful, often used to describe sarcasm that is intended to be hurtful.
* Dry: sarcastic in a quiet, understated way.
* Sharp-tongued: given to making sarcastic remarks.
The best synonym to use will depend on the context of your sentence.