Woocommerce without wordpress
WooCommerce is a Wordpress plugin, so no, you can't run it without Wordpress. If your goal is to make the backoffice simple to your client, you can strip all the unnecessary menu items from the sidebar, so he only sees the WooCommerce options. Take a look at this reference.
For example, to remove the Plugins item, in the theme's functions.php add:
add_action("admin_menu", "remove_items");function remove_items() { remove_menu_page("plugins.php");}