Unfortunately SSIS does not have an SFTP connector which can obviously cause issues when trying to GET or PUT to/from an SFTP server. Thankfully, Clement Prashant Baker posted an article regarding a workaround that does not require 3rd party software and does the job fairly well. By downloading WinSCP, you can call their command line utility from an execute process task in SSIS.
Executable: C:\Program Files\WinSCP\WinSCP.com
Arguments: -script=C:\DATA\USSCO\IMAGES\sftp.extract
