This article describes the process of designing and creating six computer-based simulations for school leadership training programmes, in the context of the Chilean school system. For the design and construction of the simulations, six scenarios were selected from case analysis of principals with formal training and experience in different contexts. These scenarios were turned into stories with decision branches, and scores were assigned to the decision-making events according to national and international leadership standards. Finally, the scenarios were coded and installed onto a platform, which was adapted to capture quantitative and qualitative data. The simulations were applied to principals and candidates for school leadership positions. The process of creating and implementing the simulations demonstrated that it is possible to introduce a tool specifically designed to improve the decision-making abilities of school principals and leaders, replicating the Chilean educational context. This is a step forward in efforts to facilitate learning experiences based on decision-making situations contextualised and relevant to the training of school leaders. Finally, the use of computer-based simulations has great potential to scale the exchange of knowledge and make it universally accessible as a complement to other training opportunities in the careers of school leaders.