functions.php

<?php
/**
 * Load a custom template for vendor taxonomy
 */
function load_custom_vendor_template( $located, $template_name ) {
	if( is_tax( WC_PRODUCT_VENDORS_TAXONOMY ) && 'archive-product.php' == $template_name ) {
		return get_stylesheet_directory() . '/woocommerce/taxonomy-shop_vendor.php';
	}
	
	return $located;
}
add_filter( 'wc_get_template', 'load_custom_vendor_template', 10, 2 );