You can use this code once set page template for specific post. If the template isn’t set, you cant enqueue your script.
if ( $post->_wp_page_template === 'sky-template.php' ) {
wp_enqueue_script();
}
Remember to replace sky-template.php with your template file name.
Edit:
You can get some help from this question.
_wp_page_template to dynamically use template