You can retain your current SSL certificate and install it on your new hosting account. The certificate will need to be used for the same domain name, though.
If you already own an SSL, create a ticket with our Support department and we'll get your SSL ported over to your new account for you.
Note: if we're doing a cPanel to cPanel migration for you, the SSL certificate will be included automatically.
See also Install an SSL Certificate, Install an SSL Certificate on VPS or Dedicated