Can't find a good one? Must not be looking very hard...
GT Arena
Autumn Ring (& mini)
Grand Valley
Deep Forest
Trial Mountain
SSR5
Eiger Short Course
Matterhorn (all are good, short is best IMO)
Cape Ring (all of them)
London
Tokyo R246
Madrid
Cote d'Azure
Rome
Tsukuba
Suzuka
Fuji
Motegi (all have good sections)
Spa
Redbull Ring (long & short)
Silverstone (all of them)
Stowe
Leguna Seca
Streets of Willow
Ascari
Bathurst
Brands Hatch Indy Circuit (80s in reverse is the best)
Daytona
Indianapolis (road course)
Circuite de la Sarthe
Nurburgring (GP and Nordeschlief)
-Monza has two decent sections.
-SSR7 has two good sections (amongst my personal favorites)
edit: oops, I forgot Apricot Hill
If you can be more specific in terms of what you're looking for in a "good drift track", we can narrow things down for you a bit. But basically, if it's got pavement and a corner, chances are someone around here has figured a good way to drift it.