https://www.bts.com/business-simulations

Leadership may have many dimensions and could be viewed in number of ways. I assume that you referring to academic leadership in class. If yes, that roles and tasks delegation could be very practical. This is a way to provide students with opportunities to become group leaders and at the same time to work independently as individual. The other academic Leadership could be at the University Administration level. In general a good leadership requires an excellent and committed team that agrees to work together to achieve common goals that everyone understood and agreed on. Having working team suggests that each team member is respected and his or her opinion is valued and listened to.

You may want to look into games that simulate leading change: http://www.thenetworkinc.org/buy-rent/purchase-games/. When it comes to systems thinking, you may want to look at The Beer Game: http://opim.wharton.upenn.edu/~sok/papers/b/BEERGAMEINSTRUCTIONSCOMPLETE.PDF