In recent years, there has been an increasing interest in the presence of sensors in mobile devices. Emergence of multiple modalities based on these sensors greatly enriches the human-mobile interaction. However, mobile applications slightly involve sensors and rarely combine them simultaneously. In this paper, we seek to remedy this problem by detailing the key challenges that face developers who want to integrate several sensor-based modalities and combine them. We then present our model-based approach solution. We introduce M4L modeling language and MIMIC framework that aim to produce easily sensor-based multimodal mobile applications by generating up to 100% of their interfaces.