Hello Anina, 

There is field in Odoo inside product website_url which is computed type. You can inherit computed method _compute_website_url with the following code:

def _compute_website_url(self):

   super(ProductTemplate, self)._compute_website_url()

      for product in self:

        product.website_url = #yoururl

You can also have a look at https://apps.odoo.com/apps/modules/13.0/seo_url_redirect/ to fulfill your requirements. 

Thanks

Anisha Bahukhandi