Of course .SAR files are jBoss specific, just like the server/<environment>/conf and server/<environment>/lib folders. It is just a deployment strategy that is clean and easy to manage.
In Tomcat (which I use for development because of its much faster start) I create an OpenSourceLibs subfolder of the server's lib folder and modify its configuration files so that it recognizes it. In that subfolder I put the exact same contents that I put in the jBoss OpenSourceLibs.sar.