No. There is no requirement for formal training of internal auditors in 9001:2015.
Clause 9.2 does include "NOTE See ISO 19011 for guidance", and 19011:2018 has clause 5.4.2 "Competence of individual(s) managing audit programme"; but a) 19011 5.4.2 does not require formal training, and more importantly, b) 19011 adherence is NOT a requirement of 9001.