The patch management module is part of the "System Reliability Manager" pack. You can download it from here:
http://wwws.sun.com/software/solaris/sunmanagementcenter/get.htm
The other modules in the pack include a core dump analysis module, a script launcher module, and a file watcher module.
You can find an overview of all 4 modules in the Users Guide here:
http://docs.sun.com/source/816-0859/pugTOC.html
Regards,
Aronek
Note: I am an employee of Halcyon (http://www.halcyoninc.com)