It depends on what type of skills one want to achieve. There are several simulations management games i.e. Hospital, Military, City, Disaster, Business, Vehicles(Flight, Car, Truck, etc), Farming etc.
There are training videos available. They present a situation either recreating a real life case or a fictional case, and then leave it to the students to discuss and take a decision.
The question is too general. The field of decision-making deals with many issues, methods and aspects. If you can describe the issue more specifically it will be better.