Trade with villagers
Sell items to villagers in modded Minecraft
Find coins in loot chests if the server or modpack adds them
Complete quests on servers or modpacks that reward coins
Use a server economy by selling items to other players
Mine valuable ores and exchange them for coins on economy servers
Kill mobs if the server rewards mob drops with coins
Fish for treasure if the server or modpack includes coin rewards
Use commands if you are an admin or in creative mode on a server that allows them