We present the initial results from a multiwavelength study of the Supernova Remnants' (SNRs) population in a sample of six nearby galaxies (NGC2403, NGC4214, NGC4449, NGC4395, NGC5204, NGC3077) based on optical, X-ray (Chandra) and infrared (Spitzer) observations. Preliminary results show the detection of new SNR candidates. The verification of a number of sources with already known SNRs illustrate the accurate eligibility of the discovery method. We discuss the analysis of the data and we show representative deep Halpha and [S II] emission line images of the galaxies with optical SNR candidates. In order to understand the emission from SNRs and to obtain a more complete picture of the overall SNR population, we compare the optical sources with SNR candidates identified in our X-ray observations. Based on these data we investigate how the optical SNR detection rates compare with detection rates in the X-ray band. Furthermore, we investigate the existence of dust around these sources using infrared observations and the influence of dust obscuration in the detection of SNR candidates.