The digital transition and the ecological transition are happening simultaneously and transforming businesses and policies around the world. The exponential development of digital technologies generates unprecedented quantities of data and changes the way all societies function. Hence, significant opportunities are created for sustainability and circular economy strategies to be implemented. The concept of smart territories is emerging as one of the new paradigms for territorial management coupling the digital tools to sustainability and circular economy models. This new concept has not been fully exploited yet and many challenges on how to achieve smart territories are still to be identified and tackled. The present work explores the main building blocks of smart territories, data exploitation, digital technologies and digital twins and their synergies with the implementation of circular economy strategies. A systematic literature review is performed to analyse the precedent works and complemented by MERISE methodology to sketch the mock-up of a digital territorial platform. Through this work, potential contributions of digital tools to promote and accelerate the circular economy on a territorial level are shown. The findings are discussed and analysed, and then positioned and applied for the Paris-Saclay territory. After the current field is analysed, a mock-up of a platform is proposed through the MERISE methodology. There, simulations could be done by public authorities and the main actors to compare, test, and evaluate different scenarios.