The Brooklyn Nets are dead last in the NBA when it comes to season ticket sales — with demand off more than 30% from last year as the new season tips off, sources told The Post.

For the 2022-23 campaign, billionaire Joe Tsai’s money-losing franchise had sold roughly 5,500 season tickets at the 17,732-seat Barclays Center, according to an NBA owner and an insider who both saw a recent confidential league report.

That’s well below last year’s total — which insiders estimated between 8,000 and 9,000 — and lands the Nets in last place among the NBA’s 30 teams, according to league insiders.

Last season, single-game sales buttressed the season ticket total to help the Nets finish 10th in average paid attendance, according to NBA confidential financials obtained by The Post — not far behind crosstown rival Knicks. The Nets drew 14,919 per game, a 26.3% spike from the previous non-pandemic year, generating $2.15 million in average net gate receipts, a 108.5% increase year-over-year, according to the data.

Despite last season’s soaring attendance, the Nets and Barclays Center lost between $50 million and $100 million, The Post reported exclusively, among the worst in the league.