Hi,
Thank you for posting in Symantec community.
I would be glad to answer your query.
You can refer the following article to find out more info about Third-party security software removal.
Article: Third-party security software removal support in Symantec Endpoint Protection 12.1.2 and later
http://www.symantec.com/docs/TECH195029
You will have to create custom SEP client package with the help of SEPprep competitive tool.
SEPprep is an unsupported tool that is designed to uninstall any competitive product automatically
The SEPprep.ini configuration file has a number of options that control how the SEPprep tool works
Into the SEPprep.ini configuration file manually add the product names ( McAfee agent, HIPS, site advisor) to remove it from the systems and install SEP on it.