I found some code snippets on the net but none of them were working on WordPress 5.2.3 and Woocommerce 3.6.4. Add this two functions in your functions.php in wp-content/themes/myTheme.

/**
 * Notify admin when a new customer account is created
 */
add_action( 'woocommerce_created_customer', 'woocommerce_created_customer_admin_notification' );
function woocommerce_created_customer_admin_notification( $customer_id ) {
	wp_send_new_user_notifications( $customer_id, 'admin' );
}


add_filter( 'wp_new_user_notification_email_admin', 'my_wp_new_user_notification_email_admin', 10, 3 );
function my_wp_new_user_notification_email_admin( $notification, $user, $blogname ) {
	$notification['headers'] = "From: Sender <user@domain.tld> \n\r cc: Receipient <user@domain.tld>";
	return $notification;
}