Sakamoto started her first full senior season at the 2017 Asian Figure Skating Trophy, placing first in both segments to take the gold. At the 2017 U.S Classic, she placed fifth in the short program and 4th in the free skate to place fourth overall, behind compatriot and gold medalist Marin Honda. Making her senior Grand Prix debut, she finished 5th at the 2017 Rostelecom Cup after placing fourth in the short program and fifth in the free skate. At the 2017 Skate America, she scored new personal best scores for both segments of the competition; she placed second in both the short program and free skate and won the silver medal overall behind teammate Satoko Miyahara.