If the machine does not have Internet access and you want to scan it, you would need anyway to download latest definition if you want the scan to be effective (http://www.symantec.com/docs/TECH131732).
Another technology exists, called PowerEraser (http://www.symantec.com/theme.jsp?themeid=spe-user-guide) to consider more like a generic removal tool, but it also requires Internet access to communicate with Symantec reputation servers.