Project Management is a very specialised topic, and generally PRINCE2 specialists are used to train people on it. However, many people do not need that level of training, and understanding the principles is sufficient. In these cases, more generalist L&D practitioners may be asked to design and deliver something.
Here are some (quite old) resources from my past that may be useful.
A Standard for Project Management - This document acted as summary 'how to' guide for managers in a specific company
This top-line outline broke down the planned training programme (it was quite a comprehensive programme!)
This Project Management Body of Knowledge is a hefty tome produced by the Project Management Institute of America. It's a bit old now, but the principles will still be relevant.
7 Keys to Successful Project Management is a paper produced by IBM outlining what it believes makes a successful project.
Here's a simple Summary Handout that can be used as a basis for delegate materials (the formatting isn't great - it's a good few years old)