Jones, 39, and Cardiff Blues pair Danny Wilson and Matt Sheratt have been added to Wales' staff for the Pacific Islands tour in June 2017.
Wales head coach and assistant Rob Howley are away with the British and Irish Lions next summer.
"Stephen will obviously get a lot out of it but I think there'll be more going the other way," said Pivac.
Jones played well over 200 matches for Llanelli and Scarlets and returned to west Wales as a backs coach in 2015 after a spell as part of Dai Young's coaching team at Wasps.
Pivac believes he has a future at international level.
"He's been identified as a coach with a lot of potential and someone I believe will be a fine international coach going forward. He's going to be world class," said the New Zealander.
"Wales are talking about playing an attacking game so I think Stephen will be able to add something there. He's taken a lot of his qualities he showed as a player into his coaching."
Jones scored 917 points in 104 appearances for Wales and played fly-half in six Test matches for the British and Irish Lions.
He is now sharing his expertise with Scarlets stand-off Rhys Patchell, a combination Pivac says is key to the team's success.
"The relationship between the two is blossoming and that's great for Welsh rugby going forward," he added.
"Technically Stephen is very very sound, tactically very switched on. We're in a pretty good place as a result of the hard work he's been doing."

The Leeds site is home to rugby league side Leeds Rhinos, rugby union side Yorkshire Carnegie and Yorkshire County Cricket Club.
Plans include a new South Stand on the rugby ground and a new joint stand overlooking both the rugby pitch and cricket ground.
A public consultation over the proposals is due to start in February.
The capacity of the cricket ground would increase under the plans with the aim of hosting matches in the 2019 Cricket World Cup and securing future Test matches.
Plans were revealed in 2014 for a Â£50m revamp of the cricket ground, which currently holds about 17,000 spectators.
The new combined stand proposes about 4,200 seats for cricket and 3,800 facing the rugby pitch.
The new South Stand for the rugby stadium has a planned capacity of 7,700 with 2,200 being seated.
Gary Hetherington, Leeds Rhinos chief executive, said: "It will present a major construction challenge and inevitably cause some disruption for all teams during that period.
"Our [rugby] stadium capacity will reduce to just over 13,000 for a period during the 2017 season."
Funding is to be provided by a combination of public and private sources including Yorkshire County Cricket Club and Leeds Rhinos.
Leeds Rhinos also plan to sell sites in Weetwood and Tingley for housing development with the receipts invested in the scheme.
Consultation events are planned including a four-day exhibition at the Headingley ground.
Scarlets coach Wayne Pivac says Wales will gain when Stephen Jones joins their coaching team next summer.
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New proposals for the redevelopment of the Headingley Stadium have been revealed.