The 23-year-old England full-back is widely regarded as Super League's hottest property and remains contracted to the Warriors for another four years. But Tomkins is expected at some stage of his career to try his luck in Australia's NRL, and a switch of codes cannot be ruled out.
Wane spoke for the first time, at Wigan's pre-season media day at Orrell, of the likelihood of losing the club's marquee player when he revealed he was leaving Tomkins out of all the trial matches in order to consider other full-back options.
"I need to look at other people," Wane said. "Sam is not going to be with us all of his career so I need to look at other full-backs as well and other options that we have."
Wigan lost reserve full-back Matthew Russell to the Australian game in the winter but Wane has given youngsters Jack Murphy and Dominic Manfredi the chance to impress in the pre-season games against Leigh, Hull KR and Salford, and confirmed that Tomkins will not play against Warrington in the Ben Westwood testimonial match next Saturday.
Tomkins, who last year became England's record tryscorer, signed a 12-month contract extension in November 2011, on the day older brother Joel signed for Saracens.
As part of the deal, which was thought to make him Super League's biggest earner on around £300,000 a year, Tomkins agreed not to talk to rugby union or NRL clubs for the following three years.
"We've got him for this year and hopefully the year after," Wane added.
Tomkins, who played a one-off rugby union game for the Barbarians in the autum of 2011, insisted he was not looking beyond 2013 with his home-town club.
"I'm waiting to start the season with Wigan, I'm not thinking about anything else right now," he said.
