Action plays a central role in entrepreneurship and entrepreneurship education. Based on action regulation theory, we developed an action-based entrepreneurship training. The training put a particular focus on action insofar as the participants learned action principles and engaged in the start-up of a business during the training. We hypothesized that a set of action-regulatory factors mediates the effect of the training on entrepreneurial action. We evaluated the training's impact over a 12-month period using a randomized control group design. As hypothesized, the training had positive effects on