Override WooCommerce template files via a plugin.

wc_plugin_template_load.php

<?php
/**
 * WooCommerce Plugin Template Loader
 * Override WooCommerce template files within a custom plugin folder
 * http://gist.github.com/danchivz
 *
 * Licensed under the MIT license.
 */
 
 /**
 * To override templates within a plugin, two filters are provided by WooCommerce, ' woocommerce_locate_template' and 'wc_get_template_part'. 
 * Create a subfolder named 'woocommerce' inside the plugin folder, and place there custom templates. 
 * Templates will be loaded in the following hierarchy:
 *	theme/template_path/template_name 
 *	theme/template_name
 *	plugin/template_path/template_name 
 *	default/template_name
 */

// get path for templates used in loop
add_filter( 'wc_get_template_part', function( $template, $slug, $name ) 
{ 
    // look in plugin/woocommerce/slug-name.php or plugin/woocommerce/slug.php
    if ( $name ) {
        $path = plugin_dir_path( __FILE__ ) . WC()->template_path() . "{$slug}-{$name}.php";    
    } else {
        $path = plugin_dir_path( __FILE__ ) . WC()->template_path() . "{$slug}.php";    
    }

    return file_exists( $path ) ? $path : $template;

}, 10, 3 );


// get path for all other templates.
add_filter( 'woocommerce_locate_template', function( $template, $template_name, $template_path ) 
{ 
    $path = plugin_dir_path( __FILE__ ) . $template_path . $template_name;  
    return file_exists( $path ) ? $path : $template;

}, 10, 3 );

?>

stackoverflow.com/a/35252520/4689173 this works for single product.php