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"I think there is a good case for it," he told BBC Radio 4's Today programme.
The prime minister did not deny reports he had asked Justice Secretary Michael Gove to look into it.
Mr Cameron, who is renegotiating Britain's EU membership ahead of an in-out vote before 2018, said he was "very suspicious" of Brussels.
The prime minister has said he wants the UK to stay in a reformed European Union, but he has not ruled out campaigning to leave if he cannot secure the changes he wants. [...]
It has been reported that the UK government will amend domestic law to make clear that Parliament is sovereign and that Britain's courts are not bound by the EU Charter of Fundamental Rights - a legally binding charter which set out a range of civil, political and social rights enjoyed by the bloc's citizens.
Mr Cameron said Parliament's sovereignty was "already asserted" in the Referendum Act - the legislation paving the way for the in-out vote - which prevents "significant" powers being passed to Brussels without UK voters being consulted in a referendum.
But he added: "If it's necessary to do that again, in more detail, to make it even clearer to people that our Parliament is sovereign... I think there's a good case for it and so we'll look very carefully at it."