Hi Aditi,
Per the "CA SiteMinder® Agent for SharePoint 12.52 Platform Support Matrix, the Agent for SharePoint is only supported with SharePoint resources on the backend.
Following is from the PSM at the following link;
https://support.ca.com/phpdocs/7/5262/5262_SiteMinder_Agent_For_SharePoint_12_52.pdf
3. SiteMinder Agent for SharePoint r12.52 supports:
a. SharePoint 2010 Foundation, Server and Enterprise editions.
b. SharePoint 2013 Foundation, Server and Enterprise editions
c. SharePoint web applications in claims mode only; web applications in Windows classic mode are not supported.
The proper solution would be to install the CA Access Gateway (fka Secure Proxy Server) with the Federation Gateway enabled. The CA Access Gateway is available under the standard SiteMinder Licenses while the Agent for SharePoint requires a separate license.
Hope this helps,
Rick