Net::SFTP is the way to go here. I'm using it in a project right now in fact. Be aware that while Net::SFTP is easy to install, it's main dependancy Net::SSH::Perl is all kinds of fun to install and has many dependancies. You'd be wise to use CPAN.pm to install it.

Once installed, you'll find the API slightly different if you are used to Net::FTP but you should be up to speed in no time.

Update: Corrected some evil typos.

-- vek --