If you don’t need to use SKUs at all in your shop, you can disable them completely by using this plugin.
This plugin should work with any WooCommerce installation since it hooks up to the core functionality of WooCommerce. Note that at least version 2.1.0 of WooCommerce is required.
After installation of Woocommerce Remove SKU plugin navigate to the WooCommerce => Setting and on the settings page click on the SKU Settings tabs. After that select the Yes option from the drop-down and click on the Save Changes button to save your changes.
Now visit the on your website and open the product details page, you will see your SKU will be removed.