nopCommerce within a SaaS solution

Hi,

Is there any solution as open source that i can use to implement a SAS solution for nopCommerce, so customers can use this platform to create thier website for nopCommerce automatically?

It requires customization.  It's been discussed before.  Search the forums for "multi-tenant"
E.g.,
https://www.nopcommerce.com/en/boards/topic/67346/nopcommerce-multi-tenant-42-is-released