Stress and deformation behavior are essential for ensuring structural stability and safety of tunneling projects. Numerical modeling has emerged as the most reliable approach for precisely evaluating stress and deformation, enabling more informed decision-making in tunnel design and support systems. This study proposes a tunnel alignment in the Lesser Himalayan Region of Nepal at Sanga Pass based on field-acquired rock joint data. It utilizes RMR and Q values from line geological mapping to characterize the rock mass. The support is then designed for horseshoe-shaped twin tunnels using an empirical approach, and a detailed 2D finite element continuum model is employed to predict stresses and deformation using Phase2 software. The results from this numerical simulation provide valuable insights for designing and optimizing appropriate tunnel support systems.