Low-cost sustainable seismic isolators made up of scrap-rubber tyre pads are being explored for possible application to structures and components as an alternative to conventional elastomeric seismic isolators. The rubber pads have cross-layers of nylon-chords embedded in the rubber volume. The Finite element (FE) analysis of scrap tyre rubber pad (STRP) isolator, comprised of composite rubber layers is carried out to understand mechanical behavior and estimation of mechanical properties of STRP isolators, as analytical solutions available for conventional elastomeric isolators fail to predict the mechanical behavior of STRP isolators. The STRP considered in this study is fabricated from bias ply tyres vulcanized with an intermediate steel shim and isolator plates. The FE model of STRP was developed in finite element software package LS-DYNA and validated with experimental data obtained from axial compression tests conducted on fabricated STRP isolator. The highly nonlinear behavior of rubber presents a major challenge in its modeling especially at large deformations. Hyper elastic material models of rubber are calibrated using uniaxial tensile tests conducted on rubber coupons from the scrap tyres. The STRP model is subjected to axial compression and horizontal shear loading to estimate mechanical properties and ultimate axial capacity. Finally, recommendations are made for the selection of material models and appropriate modeling parameters to accurately predict the behavior of STRP isolators.