Yes you can. How is your application deployed? Is it in exploded form? If yes have a look at:

http://wiki.jboss.org/wiki/Wiki.jsp?page=RedeployAnApplicationWhenChangeAFileInAnExplodedDeploymentDirectory

However, if your application is deployed as an archive, then just delete that archive from the deploy directory(which will undeploy it) and put the updated archive into the deploy directory(which will redeploy the application). Note: If you are doing this on some production environment, maintain a backup of the archive that you are about to delete, just in case the new archive runs into some issues.