Prince George's County Executive Lawrence J. Hogan, who is seeking the Republican nomination for the U.S. Senate, reorganized his campaign staff this week in an effort to "change the campaign's direction" by focusing more on Democratic incumbent Paul S. Sarbanes and less on Hogan's opposition in the Sept. 14 primary, according to Lawrence Hogan Jr., the candidate's son and spokesman.

Mary Hasenfus, deputy political director of the Republican Senatorial Campaign Committee, has replaced Mike Hoback as campaign manager. Hogan also dismissed a campaign consultant, William Lee.

Prior to last Tuesday's deadline for filing in the primary race, Hogan had been concerned that former senator J. Glenn Beall Jr. would join the field and divert support and funds from Hogan's effort. But Beall did not file, leaving Montgomery County businessman V. Dallas Merrell as his most serious primary foe. Merrell's off-again, on-again campaign is already more than $70,000 in debt.

The Hogan forces are having money problems as well. As of June 30, Hogan had spent all but about $4,000 of the $212,000 he has raised. But Hogan Jr. said yesterday that his father has raised "quite a bit of money" since June 30, although he could not give a specific figure.