Can sex be subdued because of carpal tunnel syndrome?

Depends: How severe is the carpal tunnel? This can be a nagging painful problem, but should not interfere with intercourse.

Potentially: Yes, potentially. For example, if carpal tunnel syndrome is from overuse, rest can potentially resolve it. If from inflammation, then if that can be addressed symptoms can resolve.

Uncertain: If your hand position during sex causes numbness or pain, this may distract you from the sexual act. If so, you may have to modify your routine. If you have no problem with discomfort during sex, carpal tunnel should not impact your performance or desire. (if you are referring to masturbation, the answer is likely yes).