SFTP is only available to cPanel users for secure connection you can use FTP over SSL/TLS.
To enable TLS Encryption Support from WHM
Go to:
Main >> Service Configuration >> FTP Server Configuration
Set TLS Encryption Support to optional
On the FTP client use server type as follows:
Host: domain or Ip Port : 21 Server Type : FTPES -FTP over explicit TLS/SSL
That’s it.