"[When] we got closer we realised it was jellyfish," she told the BBC. "It was like bubble wrap across the beach."
Although a common sight on Australia's east coast, the mildly venomous marine stinger is rarely seen in such numbers.
Marine biologist Lisa-Ann Gershwin said she gasped when she saw the pictures.
"It's like wallpaper," she said. "They are just cheek by jowl. They are packed so tightly. It's a sea of blue."
Dr Gershwin said the phenomenon was probably caused by a combination of factors including warmer waters, abundant nutrients and an absence of predators.
Northerly winds and tide conditions may have also contributed, she said.
Ms Lawson said she had never seen so many jellyfish. They had started to smell "pretty rank", attracting complaints from locals, she said.
Dr Gershwin said she expected the jellyfish to dry out on the sand and be eaten by birds.
The Sunshine Coast Daily reported that recent strong north-easterly winds had contributed to a spike in jellyfish sightings.
According to Surf Life Saving Queensland, more than 22,800 swimmers were treated for stings by another jellyfish species, the bluebottle, on the Sunshine Coast from 1 December to 31 January.
Dr Dan Capps said he treated three dogs for stings at his Sunshine Coast veterinary clinic at the weekend.
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