Sensitivity of the SHiP Experiment to Hidden Particles at the CERN SPS

New Physics can be explored by connecting the Hidden Sector to the Standard Model through hidden particles, which are very feebly interacting and have masses below the Fermi scale. The search for Hidden Particles (SHiP) experiment aims to search for hidden particles produced by transferring SPS proton beams into the Beam Dump Facility's fixed-target. In this thesis, the SHiP's sensitivity to two hidden particles, Dark Photon and Axion-Like-Particle, is studied. In order to achieve this goal, a chain of $\textit{physics implementation}$-$\textit{MC grid production}$-$\textit{sensitivity analysis}$ is composed, which is used to exclude a phase-space contour with a 90\% confidence level. The results show that SHiP promises unique sensitivity regions which have not been investigated or considered previously.