Self-sensing composite materials based on piezoelectric nanofibers are attracting great interest in the last years thanks to their self-powering capability and the low-intrusiveness on the mechanical structure of the material. In this study, core-shell piezoelectric nanofibers are used to fabricate a sensor which is able to localize a mechanical impact occurring on its surface. The peculiar disposition of the nanofibers allowed to lead back to the impact position by comparing the output voltages which refer to each specific area of the sensor.