The group from the Tasman Islands crossed over by boat to the Malaita Outer Islands on Boxing Day, allegedly to purchase the local homebrew called Kaleve.
They were arrested by police and screened by medical authorities in the outer islands before being transported to the capital.
In Honiara, they were further screened then released to police after testing negative for Covid-19.
Three 19-year-olds and a 34-year-old have been charged with illegal entry by a non-citizens under Covid-19 state of public emergency regulation.
