Simulation and role-play have a proven track record as pedagogic techniques to provide students with insights into geopolitics, diplomacy, and international relations. Since the first Model United Nations (MUN) in 1947, simulations have proliferated within secondary and tertiary educational settings. However, these activities overwhelmingly focus on recognised nation-states, neglecting polities that are not UN member states, but that are often acutely affected by conflict and human rights abuses. This paper is part of a broader project that is seeking to bring the realities and stories from such communities, territories, and peoples – a number of which have come together as the ‘Unrepresented Nations and Peoples Organization’ (UNPO) – to a wider audience. Loosely based on MUN simulations, the ‘Model UNPO’ exercise involves participants being assigned a UNPO member, researching that polity’s context and rights claims, and coming together for a structured role-play debate. Drawing on participant observation of Model UNPO exercises with 16–18 year old students at thirteen UK secondary schools we examine how geopolitics can be taught and learned within school classroom settings, how young people make sense of geopolitics, and how they imagine and articulate alternative internationals. We assess what simulation exercises can offer to understandings of the intersection of young peoples’ geopolitics and geographies of education. In doing so, we analyse how students draw on ‘known worlds’ and advocate for possible worlds through role-playing unrepresented diplomats, and examine the role of clause writing in the scripting of geopolitical imaginaries, and how role-playing forges empathy and solidarities. We conclude by making the case for foregrounding young people as critical and creative geopolitical thinkers.