You can select Application as FTP, so that it will allow/block FTP traffic for a specific set of people. But, there is no specific App available for SFTP. SSH File Transfer Protocol (also Secure File Transfer Protocol, or SFTP) is a protocol which uses SSH to transfer a file. Hence it should work on TCP port 22.
Add to it,
SFTP is not like FTP over SSH, rather a new protocol designed from the ground. Hence the PAN will identify it as SSH traffic, but if you decrypt the same traffic, it will be identified as an SSH-tunnel.
There is a feature request already submitted to develop a new app for SFTP (rather SSH or SSH-tunnel).
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