Not sure if it's possible to do this in STHS, but what about...

-4 divisions, 12 teams total make playoffs
-First 2 seeds in each division make the playoffs, with the 1st seeds having a bye
-The last 2 teams are decided by record

Example (Just threw 4 random teams in a division)

Eastern Conference
Div A
(1)TOR 60 points
(2)HAM 58 points
(WC1)BUF 52 points
(WC2)MAN 51 points

Div B
(1)NEW 59 points
(2)MIN 55 points
WKP 49 points
Expansion 45 points

-TOR and NEW have byes
Matchup 1: (2)HAM 58 points vs (WC2) MAN 51 points
Matchup 2: (2)MIN 55 points vs (WC1) BUF 52 points

(1)TOR 60 points vs Winner of Matchup 2
(1)NEW 59 points vs Winner of Matchup 1

etc.