Is there a particular reason you'd want to do that? With SSH disabled, it could make it much harder for an admin to work on the system in the event of an issue. If you're concerned about security I would recommend adjusting the SSH port on the server to a custom value. We have other tips in the article here:
Question Many users often ask what is the best way to secure SSH access to their server to improve the security of their server. Answer There are a few different things you can do, such as changi...support.cpanel.net
If you do want to disable SSH you can do that from WHM >> Service Manager.