"We condemn the sentences and call for their release."
Alya Abutayah al-Howeiti, a London-based relative of the condemned men, has also called for them to be set free.
"For three months they did a hunger strike in the prison and the government tried to push them to get their passwords for Twitter, but they refused, so that led to a death sentence without any evidence of them. Just to wipe the Al-Howeitat tribe from Neom," she said.
"We need all the help we can get to raise awareness about what is going on. That would help us a lot."
The Daily Telegraph was unable to independently verify the sentence and Saudi authorities did not respond to a request for comment.
Neom, which is due to be completed by 2030, is a pet project of Crown Prince Mohammed bin Salman and has been promoted as a tourism destination for Westerners.
But behind the headlines, Saudi activists living in exile have been seeking to raise the alarm about the Bedouin al-Howeitat tribe, which they say has been forcibly displaced from the area.
It is not the first encounter the tribe has had with Saudi authorities. In April 2020 Abdul Rahim al-Howeiti, the brother of Shadli, was shot dead after a row about his eviction. The family also refused compensation for his death.