Does anyone know how i might be able to modify Magento Shipping module that is in Magento 2.3.2 to allow shipping method based on customer group?
Apply shipping method base on customer group, I think you need to do custom code or use the third-party extension. I would suggest below third party extensions.
https://amasty.com/shipping-payment-by-customer-group-for-magento-2.html https://marketplace.magento.com/meetanshi-module-payshiprestriction.html https://www.mageplaza.com/review/shipping-payment-by-customer-groups/
Hope this will help you.
Please let me know if you need further information.