No. I don't believe that Cuba sponsors or encourages terrorist activities in the United States. Cuba may not agree with many US laws or culture attributes, but this is their right as a different nation. The United States may need to watch Cuba closely, simply due to it's close proximity, but I don't feel Cuba poses a threat to the United States.
We may not like them because of their communist ways, but the fact is, they let us hold guantanimo bay there, so I would actually call them state sponsors of anti-terrorism. Also, what terrorists have been found in Cuba? What Al Queada official has been sponsored or harbored by the Cuban government? None.