A CA PPM Sandbox environment used to be located in https://cppm1109-test.ondemand.ca.com/niku a couple of years ago.
I just tried to login recently, and discovered that my account is not valid anymore.
Do you know if it's still available? And who are the current administators?
See this thread
Sandbox upgrade to v14
That should answer your questions
Thank you urmas !
I've already requested my access to Michael.