President Reagan announced yesterday that he had found a job for an unemployed Pittsburgh steelworker who thrust a resume into the president's hand last week, but he cautioned that the nation's 11 million unemployed persons should not expect the White House to become an employment agency.

The president said the administration is doing all it can to help the unemployed through its economic recovery program and the emergency jobs bill passed in March.

At a brief news conference Reagan was asked if resumes from other umemployed workers are flooding the White House and if he plans to help any of them get jobs.

"I haven't seen any of those resumes if they've been sent or anything," the president told reporters.

". . . Now I didn't expect that all of the unemployed were suddenly going to ask me to be the employment agency individually for them. I think that would be impossible.

"But at any time that I can be in any way of help in lining someone up with an employer who's looking for an employe, of course I would do it because I think it's a problem on all our minds."

In finding a job for unemployed steelworker Ron Bricker, Reagan made his second such personal effort in recent months. Late last year he made phone calls to help an unemployed New Yorker who had saved a blind man after he fell between the cars of a subway train. However, the company that hired the New Yorker has since gone out of business and he is unemployed again.

This time Reagan turned to the White House Office of Private Sector Initiatives, which tries to involve businesses in community service projects in place of government-funded programs.

It called employers in the Pittsburgh area in search of jobs for Bricker, who had approached the president with his resume last week as Reagan toured a class for retraining the unemployed for jobs in computer repair.

After an interview Tuesday, Bricker was given a job with the Radio Shack as a computer field service technician.

Last December Reagan said that if every American company found a job for one unemployed person the nation's jobless problems would be eradicated because there are "more businesses in the United States than there are unemployed."

"I would like to suggest to the whole business community--I know that there are some businesses that, themselves, are faced with troubles and can't do this, but if a lot of buisnesses would take a look and see if they could hire just one person, it'd be interesting to see how much we could reduce those unemployment rolls," Reagan said then.

On Tuesday, a group called "Resumes for Reagan" was organized in response to the presidential treatment Bricker received. The group announced plans to hold a rally for jobs at the White House on Aug. 27. "We want Ronald Reagan to put up or shut up," said Robert Warfield, the head of the group. "He's been telling people there are jobs out there and all they have to do is look for them. That's a cruel hoax."

Meanwhile, in a ceremony with ambassadors of the Organization of American States, Reagan announced a $4.4 million program to allow Caribbean region students to study subjects "crucial to development and democracy in their countries."