Games like Sim Empire
Games like Sim Empire include BidKing, Plague Inc: Evolved, Mini Motorways, Game Dev Tycoon, and House Flipper. We matched them by the tags players give Sim Empire on Steam (Strategy, Simulation, Massively Multiplayer, and Casual): closest matches first, and among equally close ones the better-known games.

BidKing
Shared: Strategy · Simulation · Casual

Plague Inc: Evolved
Shared: Strategy · Simulation · Casual

Mini Motorways
Shared: Strategy · Simulation · Casual

Game Dev Tycoon
Shared: Simulation · Strategy · Casual

House Flipper
Shared: Simulation · Casual · Strategy

Cities: Skylines
Shared: Simulation · Strategy · Casual

Two Point Museum
Shared: Simulation · Strategy · Casual

911 Operator
Shared: Strategy · Simulation · Casual

Nodebuster
Shared: Strategy · Casual · Simulation

Touhou Big Big Battle
Shared: Strategy · Massively Multiplayer · Casual

Planet Zoo 2
Shared: Strategy · Simulation · Casual

Dictators:No Peace Countryballs
Shared: Strategy · Simulation · Casual

Mini Metro
Shared: Strategy · Simulation · Casual

Papa's Freezeria Deluxe
Shared: Simulation · Strategy · Casual

Book of Yog Idle RPG
Shared: Simulation · Casual · Strategy

Hell Let Loose: Vietnam
Shared: Simulation · Strategy · Massively Multiplayer

Transport Fever 2
Shared: Strategy · Simulation · Casual

Just Go
Shared: Simulation · Strategy · Casual

Two Point Hospital
Shared: Simulation · Strategy · Casual

Transport Fever 3
Shared: Simulation · Strategy · Casual

Manor Lords
Shared: Strategy · Simulation

Two Point Campus
Shared: Simulation · Strategy · Casual

Startup Company
Shared: Simulation · Strategy · Casual

Crusader Kings III
Shared: Strategy · Simulation