Accelerated sea-level rise (SLR) seriously threatens coastal areas globally. Sand nourishments – the addition of sand to increase the beach volume – are potentially a key method to sustainably adapt to accelerated SLR and keep the low-lying hinterland protected against coastal flooding. The SOURCE project will deliver the scientific knowledge, models and design tools to develop and evaluate nourishment strategies in a multi-stakeholder co-creation process. These carefully planned sand nourishments will create the required and desired resilient and dynamic multifunctional coastal landscapes of the future.