Prof Sands said the unilateral annexation of West Bank territory would be "a grave breach of worldwide law" which would have "the most serious consequences" for both individuals, Israel and the rule of law.
Netanyahu made the comments shortly after wrapping up talks with White House envoy Avi Berkowitz and the US Ambassador to Israel David Friedman.
Israel notes Jews' historic ties to the land and its strategic value.
What's next: Ocasio-Cortez, Sanders and their allies advocate conditioning U.S. military aid to Israel should it move ahead with annexation, something that center-left and progressive advocacy groups such as J Street have started advocating in recent months.
The unprecedented list includes Jewish legal scholars, practitioners and jurists from countries such as the United States, South Africa, Israel, Australia and Canada, including the heads of some of the world's most prestigious law schools.
"The US should work to build a future in which all Palestinians and Israelis live under full equality by upholding a foreign policy that centers human rights and dignity for all people", states the letter.
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Palestinians say the blueprint would make the state they seek in the West Bank, Gaza and East Jerusalem unviable.
British Prime Minister Boris Johnson cautioned Israel on Wednesday against annexation in the occupied West Bank, saying it would violate global law and harm its drive to improve relations with the Arab world, and cautioning that London would not recognize any changes to the 1967 lines.
But the plan has come under stiff global criticism.
In addition to the Palestinians, U.N. Secretary-General António Guterres, the European Union and key Arab nations have all condemned it.
Critics say the move is a violation of worldwide law and undermines the creation of an independent Palestinian state.
"Annexation would represent a violation of worldwide law", Johnson said in an opinion piece for Yedioth Ahronoth, Israel's top-selling daily, echoing remarks he made in parliament last month. "I call on the Israeli government to abandon its annexation plans". He said he expected the annexation to take place later in July. One possibility is said to be annexing a small number of settlements near Jerusalem.
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U.K. Prime Minister Boris Johnson called on Israel not to extend its sovereignty to Judea, Samaria and the Jordan Valley in a front-page Hebrew op-ed published by Israeli daily Yediot Ahronot on Wednesday.
"Annexation would fundamentally breach a central prohibition under worldwide law of acquiring territory pursuant to the threat or use of force", they said.
However, Benny Gantz, alternate prime minister in the coalition, is known to be less than enthusiastic about the plan.
USA officials said they would like the plan to have the support of Israel's two main parties, Netanyahu's Likud and Gantz's Blue and White.
"As the people rise up across this country in protest of systemic anti-Black racism and demand a fundamental reprioritization of public investment - defunding police and investing in community safety and wellbeing - we must also work to ensure USA taxpayer funds are not perpetuating gross violations of human rights overseas", said Nadia Ben-Youssef, advocacy director for the Center for Constitutional Rights, in a statement.
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