In nuclear medicine, Monte Carlo (MC) simulation is a powerful technique to model the stochastic nature of radiation, e.g. radiation detection in single photon emission computed tomography (SPECT). The aim of this study was to validate a MC model of the Symbia Intevo Bold SPECT scanner. To this end, we conducted two experiments with Tc-99m: 1) planar imaging with a point-like source to evaluate the detector response in terms of intrinsic energy resolution, spatial resolution and detector efficiency and 2) tomographic imaging with a NEMA IEC body phantom to evaluate the image quality in terms of activity recovery coefficient. The experimental results were then compared with the MC simulations performed in the same configuration and with the reference values provided by the manufacturer. The spatial resolution showed good agreement among all three values at 10 cm but had slight deviations (below 1.2 mm) at further distances. Detector efficiency measured from simulation and experiment was slightly higher than the manufacturer value with a relative difference below 7.1%. The activity recovery coefficients were comparable between the simulation and the experiment and reached a maximum value of 0.9 when both attenuation and scatter were corrected. The studied MC model has shown its potential to simulate the Symbia Intevo Bold SPECT scanner.