Yes, you can subject to the 2nd dose should be 14 days prior to your entry date in to Goa. This the recent update in last week. HC modified its order and allowed fully vaccinated people to enter the state. Who are fully vaccinated, post 14 days of their second dose, can enter Goa without an RT-PCR negative test or a rapid antigen test. Thank You
According to my knowledge at the moment Goa does not require an RTPCR negative test. However note that travel guidelines change very often so it is better to look at the official website immediately before travel.