Neutrino Telescopes such as the IceCube experiment at the South Pole can detect very high energy neutrinos. These experiments can be used very effectively to constrain new physics beyond the Standard Model of elementary particles. In this project we aim to constrain "secret neutrino self-interactions" using the IceCube data. We will also give a forcast of such studies for forth-coming next-generation neutrino telescopes such as IceCube Gen2. The project involves simulating neutrino propagation with self-interactions using the nuSIprop package and comparing the predicted event spectra to IceCube's public 'HESE' data. A multi-parameter scan (including coupling strength, mediator mass, spectral index, flux normalization and the sum of neutrino masses) will be performed and evaluated using test statistics. Due to the computational demands of simulating and fitting these models, access to the NAISS computational resources would be needed to efficiently carry out the analysis and parameter estimation.