Do you want to block the Teamviewer exe file or do you want to block the Teamviewer traffic.
If you the exe, than you can do it using the application and device control policy. See here for an example:
http://www.symantec.com/docs/TECH185907
If traffic, than you can create a firewall rule. See here:
http://www.symantec.com/docs/HOWTO42281
http://www.symantec.com/docs/HOWTO80714