Andre, I would focus on a volunteer activity as opposed to an actual class. Here is what I would do to get the experience you are looking for:
1) Pick a volunteer area that you feel passionately about (entrepreneurship requires passion);
2)Once you determine the volunteer focus area, then research some local groups and apply to for a volunteer position;
3)Learn the organization and all the different functions. Express interest in exploring different parts of the organization to gain experience and also study what parts of the business you enjoy;
4)Progress into roles of more responsibility and leadership over time as you gain experience.
Not-for-profits are some of the best organizations to build entrepreneurship skills and do something great at the same time.
Best of luck and keep us posted!