The paper presents a new DEVS-based simulation framework for multi-modal public transport analysis and planning based on the concept of geosimulation that integrates the capabilities of multi-agent modelling and geographical information systems. The proposed framework provides such important simulation aspects as execution possibilities of large-scale models, the support of user interactivity during the simulation execution process, as well as an effective synchronization between simulation and visualization processes. Underlying concepts, implementation details and evaluation results of the proposed framework are discussed. The practical importance and application possibilities of the research results are demonstrated by analysing public transport simulation scenarios for the Vidzeme planning region of Latvia.