Technological developments provide an opportunity for innovation and negative impacts if used incorrectly, so to anticipate being misused it is necessary to have a 3D technology innovation that can increase human resources in geomorphology. So this research is a type of R&D (Research and Development) research with the aim of; 1) creating an Ar-Sandbox modeling design; 2) knowing the development of components; 3) knowing the process of system testing; 4) modeling 3D geomorphology with augmented reality sandbox. The Augmented Reality Sandbox (AR-Sandbox) consists of a computer, sensors, a sandbox, and a short-throw projector. The research stages consist of; 1) the preparation stage; 2) the planning stage; 3) the installation stage; 4) the calibration stage; 5) the testing phase of the use of the tool. This research resulted in augmented reality prototype designs and components that were collaborated with a sandbox to carry out realaugmented 3D geomorphological modeling. Geomorphology that can be modeled using Ar-Sandbox is such as structural, fluvial and marine landforms. The modeling also shows color gradations, shapes and density of contour lines as well as real-time simulations of water movement on the earth's surface, such as the example of the Singkarak Lake modeling simulation.