Lets compare the intelligence of dinosaurs to the average human. Could the average human build a boat and sail across the ocean? not without drowning halfway because of a poorly built craft.
Absolutely. Australia was seperated from Eurasia (even according to Pangea theory) at the time when the first humans colonised it (the Aborigines). They sailed hundreds of miles on crude rafts and boats made with very basic tools out of wood. Their boats would have been pretty terrible considering they had no prior experience building them, nor any concepts of engineering or physics beyond wildly inaccurate myths and fables.
Still requires construction of a boat big enough to carry 100 tonnes of dinosaur
Our test case, the Early-Cretacious North American Deinonychus, would have weighed a maximum of 73 kilograms, based on the very largest specimens which have ever been discovered. I weigh 76 kilograms, and I assure you, I have travelled on many boats without causing them to sink. I've actually travelled, even, on a crude raft of my own construction. It didn't sink.
As for large dinosaurs, let us turn our attention the Jurassic sauropod giants, Apatosaurus and Diplodocus, which would have preceded the Dromaeosaurs by several million years. Specimens of these two creatures, who of course would have great trouble traversing the ocean, are found exclusively on the North American continent. They were most probably not even sentient, and evidence suggests that they did not colonise by boat (or else they would also be found in Asia).
What about Saurolophus, the veritable cattle of the Cretacious? Adults of this species would have weighed roughly 1.9 tonnes, but specimens appear in both the Far East and America. However, we've already established that these animals were farmed by Deinonychus and the descendant forms, so the logistical problems associated with transporting them would have fallen upon the pioneers of the Asian colonisation. I think it's very likely that infant Saurolophus were transported in those colonial ships rather than full-grown adults, because as you say, a 1.9 tonne dinosaur does not make a brilliant skipper.
Funnily enough, the Asian species of Saurolophus is distinct in size (and consequently meat yield) from its North American counterpart. Highly improbable in the case of a single, wild homogenous population on a single Pangean super-continent. Highly explicable by two distinct populations, seperated by ocean and subject to agrarian selective breeding by another species.