This paper presents the design and implementation of a Smart Irrigation System using Internet of Things (IoT) technologies for efficient agricultural water management. The system utilizes an Arduino Uno microcontroller, soil moisture sensors, and a GSM communication module to automate irrigation processes. By integrating real-time soil data with cloud-based storage through Firebase, it ensures data accessibility, analysis, and remote monitoring. The experimental results demonstrate water savings of approximately 35–40% and an energy reduction of 20% compared to conventional irrigation methods. The proposed system enhances sustainability and supports precision agriculture practices.