The 32-year-old has been with the north east outfit since 2013 when he left Wellington in his homeland to land on English shores for the first time in his career,
Sinoti boasts three tries from nine league outings this term, and a total of 14 in 57 appearances for the club, which has led to renewed terms.
The winger admitted that he required some time to think over the offer but ultimately feels he is in the right place at this time in his career.
Sinoti told the club's official website: "I'm pleased to have got it sorted and that I'll be staying with the club.
"It wasn't a decision I took lightly, I spent a lot of time speaking to my wife first and foremost, and my dad back in New Zealand, but staying just felt like the right thing to do.
"We absolutely love living in Newcastle, we've been here almost five years now and the area and the people are just amazing. It's an easy city to get around, everything is on your doorstep and the Falcons as a club have been great to me. I just couldn't see myself anywhere else, and from the moment I first landed in Newcastle I genuinely loved the place.
"We're not the biggest club but there's a real family feel. We could do with a bit of hot weather but it's all good, and I'm fluent in Geordie now as well! I totally love the accent, it's cool, and even if I can't do it properly I always take the mickey out of the boys by doing my impersonation!"