Yorta Yorta and Dja Dja Wurrung woman Ruth Langford had made the request ahead of her hearing into trespass charges relating to anti-forestry protests in 2025.
Langford argued hearing evidence on Country in Hobart would help the court better understand Aboriginal peoples' connection to the land and why she was "defending Country".
Magistrate Catherine Geason refused the application on Monday, saying Langford's defence case would not be prejudiced by not going on Country.
"The case can be fairly determined without the court going on Country," she said.
Speaking outside court, Langford said the decision was a missed opportunity and there weren't enough details provided about the reasons for the denial.
"Leadership could have been shown. We are asking that our identity and cultural knowledge be best and most-reliably heard," Langford said.
Despite refusing the application, Ms Geason noted courts had the ability to sit in regional places and evidence had been heard on Country in other jurisdictions as part of native title claims.
If granted, it is understood it would have been the first time in Tasmania's legal history that evidence would be heard on culturally significant land.
"It's another day in the colony, this is not new. But it is 2026," Langford said.
"We've had the reports, the speeches in parliament, now we need people to act. This is a heartache because once again it is a clear denial of identity."
The case was proof the island state's heritage laws were failing Aboriginal people, Tasmanian Aboriginal Centre campaigned Nala Mansell said.
"As a result we see Aboriginal people such as Ruth having to ... be charged criminally to fight to protect Aboriginal heritage simply because the legal and political system have failed," she said.
Langford had applied for evidence to be heard at Risdon Cove, the site of a massacre of Aboriginal people by British colonists in 1804.
Charges alleging Langford trespassed and failed to comply with an authorised officer over a protest in southern Tasmania in April 2025 were dropped by the prosecution on Monday.
She is expected to face a July hearing into a trespass charge over a protest at Snow Hill in January 2025.
Langford, who is self-representing in court, previously pleaded not guilty to all charges.
She said she needed to ask witnesses whether they would be prepared to attend the "colonial court" and give evidence.
Ms Geason said she understood and respected Aboriginal peoples' connection to Country.
Prosecutor Deanne Earley previously told the court she had no objection to Langford's application.