If you have time, there are baseball board games that can be purchased. However, if you do not have the time to order something, you can create one of your own.
Buy a piece of green felt large enough to make a baseball field. If you can only find squares, then sew together four of these. Find some seamstress chalk and draw the base lines. (You know, the baseball field is in the shape of a large diamond) Color squares white also for first, second, and third base and home plate. Draw a circle for the pitchers mound and color it brown light dirt.
Now, to play the game you need dice. You can designate certain numbers as a single, a double, a triple, a home run, an out, and a strike, a foul, or a ball. With the class, or a designated group of students, divide them into teams. Appoint one scorekeeper and a manager for each team who makes a line-up (who bats first, etc.); then toss a coin to see which team plays first. The batter comes to the plate (the felt is on top of a desk or table) and rolls the dice until he gets a hit or is out. After 3 outs, the next team is up until 9 innings are completed.
Perhaps someone in the class has a virtual baseball team? If so, you may be able to play a game using the computer.
To recreate the infamous World Series game in which the "Black Sox" played, you can buy some play money and let people bribe the 1919 members of the White Sox.