Christian Zimpel

This Plugin makes the Thumbnails clickable with any URL you want and open it in a new tab.
There will be new Field called “External URL” on the Product data. Just fill in any URL i.e. Affiliate URLs you want.

Thumbnail Link for Wooc

This Plugin makes the Thumbnails clickable with any URL you want. There is an Extra URL Field within the Product.

Pawel Cmachowski

Plugin is extension for WooCommerce plugin.
Plugin allows you to create multiple External / Affiliate product URLs and buttons text.
Plugin creates extra fields on External / Affiliate product edit form, with repeater of multiple external URLs. 
Also, plugin gives you ability to open external / affiliate URLs on new window.
Features:
<ul>
<li>Ability to create multiple buttons with external / affiliate URLs</li>
<li>Ability to open external / affiliate URLs in new window – configuration per product</li>
<li>Ability to display additional external / affiliate URLs on shop/category page – configuration per product</li>
<li>Ability to change additional button templates by hooks – <code>mepu_woo_product_page_template</code> and <code>mepu_woo_shop_page_template</code></li>
</ul>

Multiple external product URLs for WooCommerce

Thanks

Plugins gives you ability to add multiple external product URLs on WooCommerce product edit page.

Thumbnail Link for Wooc vs Multiple external product URLs for WooCommerce