"Train 1 is made up of 82 modules and it has taken close to two years to construct and transport these components to our LNG plant on Curtis Island," Santos downstream vice-president David Duke said.
"These final modules are currently being set in place on Train 1, using self-propelled modular transporters, before being connected to our LNG plant."
The final three structures were all cryogenic modules and weighed a total of 2777 tonnes.
The LNG project requires 111 modules to assemble both trains with the largest, a chiller module, weighing in at 2500t and recently moved into its final position.
"The arrival of Train 1's final modules and other recent construction milestones across the business demonstrate Santos GLNG's ability to deliver world-class projects and operations," Duke said.
"We are leading the way in building a new and economically significant industry for Queensland, and will deliver billions of dollars in royalty payments to the people of this state."
The GLNG project is targeting 7.8 million tonnes per annum of LNG with first production in 2015. The GLNG joint venture consists of Santos (30%), Petronas (27.5%), Total (27.5%) and KOGAS (15%).
Bechtel is building all three of the Curtis Island-based LNG projects with Arrow Energy's LNG project on the island yet to be sanctioned.