In MAS there is a new handler for SFTP which allows you to upload files to an FTP/SFTP location. However, publishing data in a csv format using the FLATFILE handler as Steven suggested, only allows it to be saved to a local or network folder. Publishing in CSV and sending the result to an SFTP location will require automation scripting, I believe, in order to "intercept" the csv file and feed it to an SFTP end point.