Tracking for particle physics instrumentation in SOI technology (TRAPPISTe-1) is an R&D project to study the feasibility of manufacturing a monolithic active pixel sensor (MAPS) in silicon on insulator (SOI) technology. The first prototype of this series of sensors has been designed with a 2 μm SOI CMOS technology available in UCL, Louvain-la-Neuve. Simulations are presented for this prototype. Leakage measurements have been done on a photovoltaic cell, manufactured in the same process on a low-resistivity substrate. As a next step, a high-resistivity demonstrator will be designed.