New physics scenarios can be probed via neutrino oscillation experiments providing direct evidence of physics beyond the Standard Model. One of the possibilities is the interaction of neutrinos with matter fermions via a scalar mediator known as scalar non-standard interactions. These new interactions can affect the standard neutrino oscillation probabilities and potentially lead to sub-dominant effects in upcoming neutrino experiments. A unique feature of SNSI is the dependence of oscillation probabilities on the absolute neutrino masses. This study investigates the impact of off-diagonal SNSI elements on oscillation probabilities, with a particular focus on DUNE. We examine the impact of SNSI on DUNE’s CP-violation sensitivity, which is altered by the introduction of SNSI phases. An exploration of SNSI effects promises valuable insights into the landscape of neutrino oscillations and CP-violation.