Early warning systems for geohazards are essential for saving lives, minimising economic losses, enhancing resilience, improving disaster response, and supporting sustainable development. This sensor design addresses the critical need to monitor ground quality and geotechnical parameters for geohazard mitigation. The need for new distributed sensing systems in geotechnical monitoring arises from the limitations of traditional methods and the increasing demand for comprehensive, real-time data over large areas. The primary objective was to create a system for monitoring parameters such as pore water pressure and horizontal and vertical ground displacement using optical fibre sensors. The system features an elongated vertical hollow member, an elastomer membrane, and an elongated horizontal flat member integrated with an optical fibre to detect horizontal displacement, pore water pressure, and vertical displacement through strain responses. The optical fibre embedded along the hollow member is highly sensitive to strain. When the elastomer membrane deforms due to changes in pore water pressure and the vertical and horizontal members deform, it induces strain in the optical fibre. The optical fibre continuously monitors strain and transmits data to a processing unit. Pre-calibration of pressure and deformation data allows for the conversion of strain data to determine exact changes in pore water pressure and deformation. This integrated system provides comprehensive monitoring capabilities, ensuring simultaneous measurement of essential ground parameters, which is crucial for assessing ground quality and stability in various geotechnical applications. This innovative design offers a practical solution for monitoring geotechnical conditions and can be further developed into an early warning system.